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A130189 Numerators of z-sequence for the Sheffer matrix (triangle) A094816 (coefficients of Poisson-Charlier polynomials). 4
1, -1, 5, -7, 68, -167, 2057, -4637, 75703, -39941, 676360, -902547, 602501827, -432761746, 2438757091, -8997865117, 346824403906, -1857709421899, 325976550837563, -282728710837871, 39928855264303811, -16874802689368067, 162083496666375118, -3212329557624761759 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The denominators are given in A130190.

This z-sequence is useful for the recurrence for S(n,m=0):= A094816(n,0) (first column): S(n,0) = n*sum(z(j)*S(n-1,j),j=0..n-1), n>=1, S(0,0)=1.

See the W. Lang link under A006232 with a summary on a- and z-sequences for Sheffer matrices.

LINKS

Table of n, a(n) for n=0..23.

W. Lang, Rationals, z-sequence.

FORMULA

E.g.f. for rationals z(n)=a(n)/A130190(n) (in lowest terms): (1-exp(-h(x)))/h(x) with h(x):=1-exp(-x).

Numerator of (-1)^n Sum_{k=0..n} A048993(n,k)/(k+1). [Peter Luschny, Apr 28 2009]

EXAMPLE

Rationals z(n): [1,-1/2,5/6,-7/4,68/15,-167/12,2057/42,-4637/24,....].

Recurrence from z(n) sequence for S(n,0)= A094816(n,0) for n=4: 1=S(4,0)=4*(1*1-(1/2)*8+(5/6)*6-(7/4)*1) with the 3rd row [1,8,6,1] of A094816.

MAPLE

seq(numer((-1)^n*add(stirling2(n, k)/(k+1), k=0..n)), n=0..20); # Peter Luschny, Apr 28 2009

PROG

(PARI) a(n) = (-1)^n*numerator(sum(k=0, n, stirling(n, k, 2)/(k+1))); \\ Michel Marcus, Jan 15 2015

CROSSREFS

Cf. A027641/A027642 (Bernoulli numbers) provide the a-sequence for the Sheffer matrix A094816.

Sequence in context: A108200 A077780 A260829 * A180755 A073624 A025546

Adjacent sequences:  A130186 A130187 A130188 * A130190 A130191 A130192

KEYWORD

sign,frac,easy

AUTHOR

Wolfdieter Lang, Jun 01 2007

STATUS

approved

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Last modified December 9 02:36 EST 2016. Contains 278959 sequences.