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Search: id:A104983
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| A104983 |
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Row sums of triangular matrix T = A104980 which satisfies: SHIFT_LEFT(column 0 of T^p) = p*(column p+1 of T). |
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2
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| 1, 2, 6, 24, 122, 750, 5376, 43856, 400518, 4046334, 44808104, 539850984, 7032370302, 98516491214, 1477264979352, 23612920280976, 400847064718166, 7202901369491694, 136596819590256984, 2726503675380494408
(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))))^-1)[n+1, k+1]))}
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CROSSREFS
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Cf. A104980.
Sequence in context: A024923 A037992 A114779 this_sequence A052862 A129101 A013068
Adjacent sequences: A104980 A104981 A104982 this_sequence A104984 A104985 A104986
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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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