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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

Gheorghe Coserea, Table of n, a(n) for n = 1..210

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: A318593 A335508 A176735 * A123792 A022520 A020236

Adjacent sequences:  A286783 A286784 A286785 * A286787 A286788 A286789

KEYWORD

nonn

AUTHOR

Gheorghe Coserea, May 16 2017

STATUS

approved

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Last modified September 20 17:16 EDT 2020. Contains 337265 sequences. (Running on oeis4.)