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Search: id:A104991
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| 1, 4, 22, 142, 1048, 8704, 80386, 817786, 9093340, 109794556, 1431360958, 20047830262, 300343272952, 4793871035416, 81232799446906, 1456671526257106, 27562347560513524, 548844246683051860, 11474015910364016086
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) {a(n)=if(n<0, 0, sum(k=0, n, (matrix(n+1, n+1, m, j, if(m==j, 1, if(m==j+1, -m+1, -polcoeff((1-1/sum(i=0, m, i!*x^i))/x+O(x^m), m-j-1))))^-3)[n+1, k+1]))}
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CROSSREFS
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Cf. A104990, A104980.
Adjacent sequences: A104988 A104989 A104990 this_sequence A104992 A104993 A104994
Sequence in context: A003287 A077056 A045744 this_sequence A027391 A134988 A081002
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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), Apr 10 2005
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