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A133005 Denominators of Blandin-Diaz compositional Bernoulli numbers C_2,n. 3

%I #15 Jan 24 2024 12:18:43

%S 1,1,3,6,45,54,63,540,405,810,13365,20412,331695,306180,65610,29160,

%T 6506325,2296350,4363065,757795500,22733865,90935460,203719050,

%U 9672226200,403009425,4836113100,22320522,2232052200,267009244425,6313519080,3425084100900,112696315578000,3018651310125

%N Denominators of Blandin-Diaz compositional Bernoulli numbers C_2,n.

%H Hector Blandin and Rafael Diaz, <a href="https://arxiv.org/abs/0708.0809">Compositional Bernoulli numbers</a>, arXiv:0708.0809 [math.CO], 2007-2008, p. 14, first table.

%e 0, 1, -23, 56, -68/45, 193/54, -655/63, 19349/540, -57736/405, 520343/810.

%o (PARI) my(x='x+O('x^40)); apply(denominator, concat(0, Vec(serlaplace(serreverse(2*(exp(x)-1-x)/x))))) \\ _Michel Marcus_, Jan 24 2024

%Y Numerators are A133004.

%Y Cf. A132092-A132099.

%K frac,nonn

%O 0,3

%A _Jonathan Vos Post_, Aug 09 2007

%E a(6) corrected and more terms from _Michel Marcus_, Jan 24 2024

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)