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A294166
Row sums of A291843.
2
1, 0, 1, 8, 71, 789, 10365, 157031, 2692497, 51519756, 1088093185, 25140587651, 630820490833, 17082650998878, 496596665961713, 15425333714935513, 509890407550644949, 17871584701588777344, 662057571007292023593, 25847670560115633381442
OFFSET
0,4
LINKS
FORMULA
G.f. y(x) satisfies: 0 = 2*x^2*(1+x)*y*deriv(y,x) + x*y^2 - (1+x)^2*(1-2*x)*y + (1+x)*(1-2*x).
PROG
(PARI)
A291843_ser(N, t='t) = {
my(x='x+O('x^N), y=1, y1=0, n=1,
dn = 1/(-2*t^2*x^4 - (2*t^2+3*t)*x^3 - (2*t+1)*x^2 + (2*t-1)*x + 1));
while (n++,
y1 = (2*x^2*y'*((-t^2 + t)*x + (-t + 1) + (t^2*x^2 + (t^2 + t)*x + t)*y) +
(t*x^2 + t*x)*y^2 - (2*t^2*x^3 + 3*t*x^2 + (-t + 1)*x - 1))*dn;
if (y1 == y, break); y = y1; ); y;
};
Vec(A291843_ser(20, 1))
CROSSREFS
Cf. A291843.
Sequence in context: A075506 A334670 A094911 * A203008 A235128 A226163
KEYWORD
nonn
AUTHOR
Gheorghe Coserea, Nov 05 2017
STATUS
approved