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A092255
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a(0) = 1; for n > 0, b(n) - n*b(n-1), b() = A076177().
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8
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1, 1, 3, 10, 23, 66, 222, 561, 1647, 5410, 14318, 42351, 137018, 372191, 1105275, 3537540, 9772767, 29090826, 92364198, 258208671, 769820418, 2429091885, 6850744365, 20447143866, 64200928194, 182303186391, 544550917797
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| For n>=1, a(n) mod 2 = A010060(n) the Thue-Morse sequence - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 22 2004
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FORMULA
| a(n)=n!*sum(i+j+k=n, 1/(i!*j!*k!)) (0<=k<=j<=i<=n). - Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 22 2004
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PROG
| (PARI) a(n)=sum(i=0, n, sum(j=0, i, sum(k=0, j, if(i+j+k-n, 0, n!/i!/j!/k!))))
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CROSSREFS
| Sequence in context: A167243 A185828 A134438 * A105861 A041327 A029880
Adjacent sequences: A092252 A092253 A092254 * A092256 A092257 A092258
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Feb 20 2004
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EXTENSIONS
| More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 22 2004
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