

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
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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

Table of n, a(n) for n=0..19.
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*x1))*x,
(1/240*(15*x^330*x^2+5*x+2))*x,
(1/4032*(63*x^5315*x^4+315*x^3+91*x^242*x16))*x,
(1/34560*(135*x^71260*x^6+3150*x^5840*x^42345*x^3540*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(vs, n), s=1..v))) end:
A213449 := n > denom(B(2*n, k)):
seq(A213449(n), n=0..19); # Peter Luschny, Oct 01 2016


MATHEMATICA

Table[NorlundB[2n, x] // Together // Denominator, {n, 0, 19}] (* JeanFrançois Alcover, Jun 29 2019 *)


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



