A124554 Row 4 of table A124550; also equals the self-convolution 4th power of A124564, which is row 4 of table A124560.

1, 4, 26, 204, 1899, 21180, 287568, 4802716, 99084889, 2531896840, 80346294380, 3173108251044, 156222183969181, 9603287701405136, 738066706464107408, 71003673625149131020, 8559188942710590217013, 1294012524894298022238700

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..17.

Formula

G.f.: A(x) = [ Sum_{k>=0} y^k * R_{4k}(y) ]^4, where R_n(x) is the g.f. of row n in table A124550.

Crossrefs

Cf. A124550; other rows: A124551, A124552, A124553, A124555, A124556.

Sequence in context: A369124 A118971 A369102 * A321586 A206391 A368968

Adjacent sequences: A124551 A124552 A124553 * A124555 A124556 A124557

Keyword

nonn

Author

Paul D. Hanna, Nov 07 2006

Status

approved