A384652 - OEIS

A384652

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A384145.

1, 1, 0, 1, 1, 0, 1, 2, 2, 0, 1, 3, 5, 8, 0, 1, 4, 9, 20, 44, 0, 1, 5, 14, 37, 108, 298, 0, 1, 6, 20, 60, 198, 716, 2359, 0, 1, 7, 27, 90, 321, 1290, 5554, 21112, 0, 1, 8, 35, 128, 485, 2064, 9821, 48838, 209175, 0, 1, 9, 44, 175, 699, 3091, 15452, 84888, 476714, 2262121, 0

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OFFSET

0,8

LINKS

Table of n, a(n) for n=0..65.

FORMULA

A(n,0) = 0^n; A(n,k) = k * Sum_{j=0..n} binomial(3*n-2*j+k,j)/(3*n-2*j+k) * A(n-j,j).

EXAMPLE

Square array begins:

1, 1, 1, 1, 1, 1, 1, ...

0, 1, 2, 3, 4, 5, 6, ...

0, 2, 5, 9, 14, 20, 27, ...