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A286786 Column 1 of A286781. 9
1, 9, 91, 1063, 14193, 213953, 3602891, 67168527, 1375636129, 30741614905, 745133551611, 19485223248311, 547092691302545, 16422216867929457, 524970306508659691, 17809453107819266335, 639153386976421052481, 24196474723945543441769, 963736849031626750711451, 40289411871795861783689799 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
PROG
(PARI)
A286781_ser(N, t='t) = {
my(x='x+O('x^N), y0=1+O('x^N), y1=0, n=1);
while(n++,
y1 = (1 + x*y0 + 2*x^2*y0')*(1 - x*y0*(1-t))/(1-x*y0)^2;
if (y1 == y0, break()); y0 = y1; );
y0;
};
Kol(K, N=20) = {
my(s = A286781_ser(N+K, 't+O('t^(K+1))));
vector(N, n, polcoeff(polcoeff(s, K+n-1), K));
};
Kol(1)
CROSSREFS
Cf. A286781.
Sequence in context: A362728 A335508 A176735 * A123792 A022520 A020236
KEYWORD
nonn
AUTHOR
Gheorghe Coserea, May 16 2017
STATUS
approved

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Last modified July 18 21:02 EDT 2024. Contains 374388 sequences. (Running on oeis4.)