A379201 Column 1 of triangle A379200; a(n) = A379200(n,1) for n >= 2.

1, 4, 13, 40, 130, 472, 1863, 7536, 30144, 118420, 460746, 1795688, 7059729, 28023636, 111978480, 448799712, 1800225540, 7223348112, 29006342666, 116643481440, 469861180529, 1895748851480, 7658862165738, 30973386496992, 125363177936450, 507777786429164, 2058225234116544

Offset: 2

Author

Paul D. Hanna, Dec 20 2024

Keywords

• nonn

Comments

G.f. G(x,y) of triangle A379200 satisfies 1/x = Sum_{n=-oo..+oo} G(x,y)^n * (G(x,y)^n + y)^(n+1). This sequence gives the coefficients of x^n*y in G(x,y) for n >= 2.

Links

• Paul D. Hanna, Table of n, a(n) for n = 2..101

Crossrefs

Cf. A379200.