A124552 - OEIS

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

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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