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A027644
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Denominators of poly-Bernoulli numbers B_n^(k) with k=2.
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2
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1, 4, 36, 24, 450, 40, 2205, 168, 350, 120, 38115, 88, 40990950, 10920, 5005, 24, 130180050, 136, 1935088155, 3192, 177827650, 1320, 1539340803, 184, 304521767550, 10920, 37182145, 24, 2814316555050, 1160
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OFFSET
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0,2
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REFERENCES
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M. Kaneko, Poly-Bernoulli numbers, J. Theorie des Nombres Bordeaux 9 (1997), 221-228.
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LINKS
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Table of n, a(n) for n=0..29.
Index entries for sequences related to Bernoulli numbers.
M. Kaneko, Poly-Bernoulli numbers
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MAPLE
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(-1)^n*sum( (-1)^'m'*'m'!*stirling2(n, 'm')/('m'+1)^k, 'm'=0..n);
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MATHEMATICA
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f[n_] := (-1)^n*Sum[(-1)^m*m!*StirlingS2[n, m]/(m + 1)^2, {m, 0, n}]; Table[ Denominator[ f[n]], {n, 0, 30}] (from Robert G. Wilson v Oct 28 2004)
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CROSSREFS
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Cf. A027643.
Sequence in context: A162990 A092960 A144153 * A174426 A198642 A062182
Adjacent sequences: A027641 A027642 A027643 * A027645 A027646 A027647
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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