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Search: id:A118395
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| 1, 1, 7, 25, 61, 481, 2731, 10417, 91225, 681121, 3493711, 33597961, 303321877, 1938378625, 20282865331, 211375647841, 1607008257841, 18157826367937, 212200671085975, 1860991143630841, 22560913203079021, 289933758771407521
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OFFSET
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0,3
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COMMENT
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Equals row sums of triangle A118394.
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MAPLE
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with(combstruct):seq(count(([S, {S=Set(Union(Z, Prod(Z, Z, Z)))}, labeled], size=n)), n=1..22); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 18 2008
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PROGRAM
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(PARI) a(n)=n!*polcoeff(exp(x+x^3+x*O(x^n)), n)
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CROSSREFS
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Cf. A118394, A118396.
Sequence in context: A061600 A098538 A033814 this_sequence A118396 A001845 A127765
Adjacent sequences: A118392 A118393 A118394 this_sequence A118396 A118397 A118398
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), May 07 2006
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