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Vladimir Kruchinin, <a href="http://arxiv.org/abs/1211.3244">The method for obtaining expressions for coefficients of reverse generating functions</a>, arXiv:1211.3244 [math.CO], 2012.
Vladimir Kruchinin, <a href="http://arxiv.org/abs/1211.3244">The method for obtaining expressions for coefficients of reverse generating functions</a>, arXiv:1211.3244
a(n):=if n<2 then n else sum((sum(binomial(k, j)*sum(binomial(j, i-j)*binomial(k-j, n-3*(k-j)-i-1), i, j, n-k+j-1), j, 0, k))*binomial(n+k-1, n-1), k, 1, n-1)/n; [_/* _Vladimir Kruchinin_, May 10 2011] */
Olivier Gérard, Jul 05 2001.
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Vladimir Kruchinin, <a href="http://arxiv.org/abs/1211.3244">The method for obtaining expressions for coefficients of reverse generating functions</a>, arXiv:1211.3244
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(PariPARI)
x='x+O('x^66); /* that many terms */
Vec(gf=serreverse(x-sum(j=2, 6, x^j))) /* show terms */ /* _Joerg Arndt_, May 12 2011 */;
Vec(gf)
/* Joerg Arndt, May 12 2011 */
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