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A115752
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Number of words created with the letters a,b,c with more c's than b's and more b's than a's.
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0
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0, 0, 3, 4, 15, 81, 168, 540, 2271, 5365, 16698, 63229, 159250, 489048, 1749933, 4576140, 13955895, 48211389, 129211818, 392441049, 1323741156, 3609608838, 10933915743, 36252591813, 100126350090, 302737691646, 990855646563
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| Mike Zabrocki, Math 5020, York University
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FORMULA
| E.g.f.: (t(1)^3-3*t(1)*t(2)+2*t(3))/6 where t(1)=hypergeom([],[],x), t(2)=hypergeom([],[1],x^2) and t(3)=hypergeom([],[1,1],x^3). - Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 22 2007
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CROSSREFS
| Cf. A092255.
Sequence in context: A135962 A171062 A171061 * A103095 A041325 A042541
Adjacent sequences: A115749 A115750 A115751 * A115753 A115754 A115755
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KEYWORD
| nonn
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AUTHOR
| Kevin Smith (kjsmith(AT)yorku.ca), Mar 28 2006
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