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 A027644 Denominators of poly-Bernoulli numbers B_n^(k) with k=2. 3
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..1000 K. Imatomi, M. Kaneko, E. Takeda, Multi-Poly-Bernoulli Numbers and Finite Multiple Zeta Values, J. Int. Seq. 17 (2014) # 14.4.5 M. Kaneko, Poly-Bernoulli numbers Masanobu Kaneko, Poly-Bernoulli numbers, Journal de thÃ©orie des nombres de Bordeaux, 9 no. 1 (1997), Pages 221-228. MAPLE (-1)^n*sum( (-1)^'m'*'m'!*stirling2(n, 'm')/('m'+1)^k, 'm'=0..n); MATHEMATICA f[n_] := (-1)^n*Sum[(-1)^m*m!*StirlingS2[n, m]/(m + 1)^2, {m, 0, n}]; Table[ Denominator[ f[n]], {n, 0, 30}] (* Robert G. Wilson v, Oct 28 2004 *) CROSSREFS Cf. A027643. Sequence in context: A092960 A323515 A144153 * A174426 A198642 A274891 Adjacent sequences:  A027641 A027642 A027643 * A027645 A027646 A027647 KEYWORD nonn,frac AUTHOR STATUS approved

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Last modified October 19 04:40 EDT 2019. Contains 328211 sequences. (Running on oeis4.)