A086637 Row sums of triangle A086636.

1, 2, 7, 35, 202, 1271, 8463, 58639, 418419, 3053702, 22687372, 171008336, 1304491048, 10051505234, 78117049696, 611612430537, 4819607926076, 38195797609995, 304234734698412

Offset

0,2

Comments

Triangle A086636 relates Catalan numbers (A000108) to ternary trees (A001764).

Links

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

Formula

G.f.: A(x) = (3-sqrt(1-4x))/2 + x*A(x)^3.

Crossrefs

Cf. A086636.

Sequence in context: A287327 A020066 A024719 * A172511 A214461 A130458

Adjacent sequences: A086634 A086635 A086636 * A086638 A086639 A086640

Keyword

nonn

Author

Paul D. Hanna, Jul 24 2003

Status

approved