A145159 G.f. A(x) satisfies A(x/A(x)) = 1/(1-x)^2.

1, 2, 7, 38, 283, 2624, 28408, 344972, 4580833, 65410070, 992850781, 15888876224, 266464473274, 4661494891166, 84761554257517, 1597453996121132, 31132664696108551, 626239933178389916, 12981131500452667888

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Formula

Self-convolution of A145158.

Prog

(PARI) {a(n)=local(A=1+x+x*O(x^n)); for(n=0, n, B=serreverse(x/A); A=1/(1-B)^2); polcoeff(A, n)}

Crossrefs

Cf. A145158.

Sequence in context: A337026 A088792 A114160 * A317985 A084552 A094664

Adjacent sequences: A145156 A145157 A145158 * A145160 A145161 A145162

Keyword

nonn

Author

Paul D. Hanna, Oct 03 2008

Status

approved