A124552 Row 2 of table A124550; also equals the self-convolution square of A124562, which is row 2 of table A124560.

1, 2, 7, 30, 159, 1056, 8812, 92062, 1200415, 19512990, 395379699, 9991017068, 315094522052, 12413464676162, 611490149713956, 37699912801819870, 2911578809929672737, 281916836769424155940, 34249052273023310929439

Offset

0,2

Comments

In table A124550, the g.f. of row n, R_n(y), simultaneously satisfies: R_n(y) = [ Sum_{k>=0} y^k * R_{n*k}(y) ]^n for n>=0.

Links

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

Formula

G.f.: A(x) = [ Sum_{k>=0} y^k * R_{2k}(y) ]^2, where R_n(x) is the g.f. of row n in table A124550.

Crossrefs

Cf. A124550; other rows: A124551, A124553, A124554, A124555, A124556.

Sequence in context: A066114 A088128 A001053 * A020045 A020135 A249474

Adjacent sequences: A124549 A124550 A124551 * A124553 A124554 A124555

Keyword

nonn

Author

Paul D. Hanna, Nov 07 2006

Status

approved