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

Author

Benoit Jubin and Vladeta Jovovic, Sep 08 2008

Keywords

• more
• nonn

Crossrefs

Cf. A136564, A138107.

Programs

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

Formula

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

Extensions

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