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A261886 E.g.f. satisfies: A(x) = A( x/(1-x)^3 ) * (1-x)/(1+2*x) with A(0)=0. 2
0, 1, -2, 11, -96, 1080, -13776, 179592, -2257536, 36167616, -1328400000, 53474351040, -364978483200, -111366266618880, 2057176091013120, 861071536310630400, -50092279632602726400, -9303569614922165452800, 1142810852264472571084800, 154051064897857365779251200, -35956459453770594679062528000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = A261885(n)/3.

LINKS

Paul D. Hanna, Table of n, a(n) for n = 0..200

EXAMPLE

E.g.f.: A(x) = x - 2*x^2/2! + 11*x^3/3! - 96*x^4/4! + 1080*x^5/5! - 13776*x^6/6! + 179592*x^7/7! - 2257536*x^8/8! + 36167616*x^9/9! - 1328400000*x^10/10! +...

A(x/(1-x)^3) = x + 4*x^2/2! + 11*x^3/3! + 36*x^4/4! + 300*x^5/5! + 984*x^6/6! - 6384*x^7/7! + 564864*x^8/8! + 615744*x^9/9! - 598890240*x^10/10! +...

where A(x/(1-x)^3) = (1+2*x)/(1-x)*A(x).

PROG

(PARI) /* E.g.f. satisfies: A(x) = (1-x)/(1+2*x)*A(x/(1-x)^3): */

{a(n)=local(A=x, B); for(m=2, n, B=(1-x)/(1+2*x+O(x^(n+3)))*subst(A, x, x/(1-x+O(x^(n+3)))^3); A=A-polcoeff(B, m+1)*x^m/(m-1)/3); n!*polcoeff(A, n)}

for(n=0, 20, print1(a(n), ", "))

CROSSREFS

Cf. A261885.

Sequence in context: A131407 A197994 A186273 * A245895 A231229 A138210

Adjacent sequences:  A261883 A261884 A261885 * A261887 A261888 A261889

KEYWORD

sign

AUTHOR

Paul D. Hanna, Sep 04 2015

STATUS

approved

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Last modified August 19 05:11 EDT 2019. Contains 326109 sequences. (Running on oeis4.)