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Search: id:A103879
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| A103879 |
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Square array T(n,k) read by antidiagonals: numerators of Stirling numbers of first kind with negative argument S1(-n,k), n,k>=0. |
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+0
2
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| 1, 1, 0, 1, -1, 0, 1, -3, 1, 0, 1, -11, 7, -1, 0, 1, -25, 85, -15, 1, 0, 1, -137, 415, -575, 31, -1, 0, 1, -49, 12019, -5845, 3661, -63, 1, 0, 1, -121, 13489, -874853, 76111, -22631, 127, -1, 0, 1, -761, 726301, -336581, 58067611, -952525, 137845, -255, 1
(list; table; graph; listen)
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OFFSET
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0,8
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LINKS
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D. Loeb, Generalization of the Stirling numbers of first kind
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FORMULA
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T(n, k) = (-1)^(k+1) * Sum[i=1..n, C(n, i)*(-1)^i*i^(-k) ].
G.f. of n-th row: 1/n! * 1/Prod[i=1..n, 1+x/i ].
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EXAMPLE
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1, 0, 0, 0, 0, 0,
1, -1, 1, -1, 1, -1,
1/2, -3/4, 7/8, -15/16, 31/32, -63/64,
1/6, -11/36, 85/216, -575/1296, 3661/7776, -22631/46656,
1/24,-25/288,415/3456,-5845/41472,76111/497664,-952525/5971968,
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PROGRAM
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(PARI) T(n, k)=numerator(1/n!*polcoeff(Ser(1/prod(i=1, n, 1+x/i)), k))
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CROSSREFS
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Denominators are in A103880. Cf. A008969.
Sequence in context: A122960 A091480 A034374 this_sequence A051722 A166408 A128618
Adjacent sequences: A103876 A103877 A103878 this_sequence A103880 A103881 A103882
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KEYWORD
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sign,tabl,frac
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AUTHOR
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Ralf Stephan, Feb 20 2005
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