A144047 Limiting values of A136564.

1, 4, 22, 111, 570, 2917, 15112, 78900, 416525, 2221529, 11974498, 65211746, 358742016, 1992975905, 11178149883, 63279615534, 361464920864, 2082869242399, 12104344580384, 70924864962233, 418922049779244

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Formula

a(n) = A136564(2*n, 3*n) for n > 0. - Andrew Howroyd, Apr 20 2020

Prog

(PARI) \\ Needs G function from A138107.
a(n)={if(n==0, 1, my(m=2*n); polcoef(G(3*n, x + O(x*x^m)) - G(3*n-1, x + O(x*x^m)), m))} \\ Andrew Howroyd, Apr 20 2020

Crossrefs

Cf. A136564, A138107.

Sequence in context: A006651 A159616 A244423 * A077543 A084157 A085939

Adjacent sequences: A144044 A144045 A144046 * A144048 A144049 A144050

Keyword

more,nonn

Author

Benoit Jubin and Vladeta Jovovic, Sep 08 2008

Extensions

Offset corrected and a(7)-a(20) from Andrew Howroyd, Apr 20 2020

Status

approved