A086624 Main diagonal of square table A086623 of coefficients of f(x,y) that satisfies f(x,y) = (1-xy)/[(1-x)(1-y)] + xy*f(x,y)^2.

1, 1, 4, 19, 100, 570, 3442, 21685, 141112, 941990, 6419174, 44493000, 312818326, 2226155632, 16008452202, 116167346499, 849724397580, 6259403310366, 46399703925202, 345894094030552

Offset

0,3

Links

Table of n, a(n) for n=0..19.

Crossrefs

Cf. A086623 (table), A086625 (antidiagonal sums).

Sequence in context: A007564 A218185 A369672 * A307121 A261490 A277956

Adjacent sequences: A086621 A086622 A086623 * A086625 A086626 A086627

Keyword

nonn

Author

Paul D. Hanna, Jul 24 2003

Status

approved