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[1

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\OT1/cmr/m/n/12 where $\OML/cmm/m/it/12 e[] \OT1/cmr/m/n/12 : \U/msb/m/n/12 N[]
 [][]\OMS/cmsy/m/n/12 ! \U/msb/m/n/12 N[]$\OT1/cmr/m/n/12 , which ex-plains how
 to de-rive the \OT1/cmr/m/it/12 suc-ces-sors $\OT1/cmr/m/n/12 (\OML/cmm/m/it/1
2 e[]\OT1/cmr/m/n/12 (\OML/cmm/m/it/12 k\OT1/cmr/m/n/12 ))\OML/cmm/m/it/12 ; \O
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[2] <xymatrix 4x3 295> [3] [4] [5] [6]
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[]\OT1/cmr/m/n/12 Now we are able to give a suc-ces-sion rule for the num-ber s
e-quence $1\OML/cmm/m/it/12 ; \OT1/cmr/m/n/12 1\OML/cmm/m/it/12 ; \OT1/cmr/m/n/
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[7]
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[]\OT1/cmr/m/n/12 E. Per-gola and R. Pin-zani,  A com-bi-na-to-rial in-ter-pre-
ta-tion of the
 []


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\OT1/cmr/m/n/12 Area of Schr^^?oder paths,  \OT1/cmr/m/it/12 Elec-tronic J. Com
-bi-na-torics \OT1/cmr/bx/n/12 6 \OT1/cmr/m/n/12 (1999), #R40.
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[8]
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[]\OT1/cmr/m/n/12 N. J. A. Sloane \OT1/cmr/m/it/12 The On-Line En-cy-clo-pe-dia
 of In-te-ger Se-quences\OT1/cmr/m/n/12 ,
 []

[9] (duchi4.aux) ) 
Here is how much of TeX's memory you used:
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 8436 multiletter control sequences out of 10000+0
 13563 words of font info for 55 fonts, out of 400000 for 1000
 14 hyphenation exceptions out of 1000
 27i,13n,25p,218b,388s stack positions out of 300i,100n,500p,300000b,4000s

Output written on duchi4.dvi (9 pages, 35004 bytes).