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 A213449 Denominators of higher order Bernoulli numbers. (Formerly N2089) 2
 1, 12, 240, 4032, 34560, 101376, 50319360, 6635520, 451215360, 42361159680, 1471492915200, 1758147379200, 417368899584000, 15410543984640, 141874849382400, 28026642660065280, 922166952040857600, 19725496300339200, 2163255728265599385600, 36926129074234982400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS See Nørlund for precise definition. The 'higher order Bernoulli numbers' considered here are the values of the 'higher order Bernoulli polynomials' evaluated at x=1 (and not at x=0, which would make things boring as x is a factor of these polynomials for n>0). This can be seen as an argument that the definition of the classical Bernoulli numbers as the values of the classical Bernoulli polynomials at x=1 better fits into the general picture than the often used definition as the values at x=0. - Peter Luschny, Oct 01 2016 REFERENCES N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). LINKS N. E. Nørlund, Vorlesungen über Differenzenrechnung, Springer, 1924, p. 459. EXAMPLE From Peter Luschny, Oct 01 2016: (Start) The sequence of polynomials starts: 1, (1/12*(3*x-1))*x, (1/240*(15*x^3-30*x^2+5*x+2))*x, (1/4032*(63*x^5-315*x^4+315*x^3+91*x^2-42*x-16))*x, (1/34560*(135*x^7-1260*x^6+3150*x^5-840*x^4-2345*x^3-540*x^2+404*x+144))*x. (End) MAPLE B := proc(v, n) option remember; `if`(v = 0, 1, simplify(-(n/v)*add((-1)^s*binomial(v, s)*bernoulli(s)*B(v-s, n), s=1..v))) end: A213449 := n -> denom(B(2*n, k)): seq(A213449(n), n=0..19); # Peter Luschny, Oct 01 2016 CROSSREFS Cf. A000367 (numerators of the polynomials evaluated at x=1 at even indices). Bisection (even indices) of A001898. Sequence in context: A033469 A012544 A009052 * A012303 A119837 A012538 Adjacent sequences:  A213446 A213447 A213448 * A213450 A213451 A213452 KEYWORD nonn,frac AUTHOR N. J. A. Sloane, Jun 12 2012 EXTENSIONS Name corrected and more terms added by Peter Luschny, Oct 01 2016 STATUS approved

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Last modified May 19 16:42 EDT 2019. Contains 323395 sequences. (Running on oeis4.)