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

0,1

Comments

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

Links

Table of n, a(n) for n=0..21.

Formula

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

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

Crossrefs

A001906, 2*A001870.

Sequence in context: A221543 A309000 A352027 * A143552 A006283 A232017

Adjacent sequences: A061179 A061180 A061181 * A061183 A061184 A061185

Keyword

nonn,easy

Author

Wolfdieter Lang, Apr 20 2001

Status

approved