

A063021


Reversion of y  y^2  y^5.


0



0, 1, 1, 2, 5, 15, 49, 168, 594, 2150, 7931, 29718, 112814, 432957, 1677050, 6547856, 25742454, 101819100, 404885630, 1617725010, 6491294600, 26147434885, 105691660110, 428578242900, 1742925259725, 7106942278683
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,4


LINKS

Table of n, a(n) for n=0..25.
Vladimir Kruchinin, The method for obtaining expressions for coefficients of reverse generating functions, arXiv:1211.3244 [math.CO], 2012.
Index entries for reversions of series


FORMULA

a(n) = sum(j=0..(n1)/3, C(n13*j,j)*C(2*n3*j2,n1))/n, n>0, a(0)=0.  Vladimir Kruchinin, May 24 2011


MATHEMATICA

CoefficientList[InverseSeries[Series[y  y^2  y^5, {y, 0, 30}], x], x]


PROG

(Maxima) a(n):=sum(binomial(n13*j, j)*binomial(2*n3*j2, n1), j, 0, (n1)/3)/n; \\ Vladimir Kruchinin, May 24 2011
(PARI) Vec(serreverse(xx^2x^5+O(x^66))) /* Joerg Arndt, May 24 2011 */


CROSSREFS

Sequence in context: A149935 A149936 A189176 * A301832 A272460 A149937
Adjacent sequences: A063018 A063019 A063020 * A063022 A063023 A063024


KEYWORD

nonn,easy


AUTHOR

Olivier Gérard, Jul 05 2001


STATUS

approved



