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A118395
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E.g.f.: exp(x + x^3).
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3
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Equals row sums of triangle A118394.
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MAPLE
| 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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PROG
| (PARI) a(n)=n!*polcoeff(exp(x+x^3+x*O(x^n)), n)
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CROSSREFS
| Cf. A118394, A118396.
Sequence in context: A061600 A098538 A033814 * A118396 A193375 A185787
Adjacent sequences: A118392 A118393 A118394 * A118396 A118397 A118398
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), May 07 2006
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