A061182 Third column (m=2) of triangle A060921 (bisection of Fibonacci triangle, odd part).

3, 22, 111, 474, 1836, 6666, 23109, 77378, 252177, 804228, 2519640, 7777860, 23709783, 71501422, 213619683, 633011454, 1862264196, 5443487406, 15820188729, 45739697306, 131624104677, 377157259848

Offset: 0

Author

Wolfdieter Lang, Apr 20 2001

Keywords

• nonn
• easy

Comments

Numerator polynomial is sum(A061177(2,m)*x^m,m=0..2).

Crossrefs

A001906, 2*A001870.

Formula

a(n)= A060921(n+2, 2).

G.f.: (3*(1+x^2)-5*x)/(1-3*x+x^2)^3.