A061178 Third column (m=2) of triangle A060920 (bisection of Fibonacci triangle, even part).

1, 9, 51, 233, 942, 3522, 12473, 42447, 140109, 451441, 1426380, 4434420, 13599505, 41225349, 123723351, 368080793, 1086665562, 3186317718, 9286256393, 26916587307, 77634928209, 222920650081

Offset

0,2

Comments

Numerator polynomial of g.f. is sum(A061176(3,m)*x^m,m=0..3).

Links

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

Formula

a(n)= A060920(n+2, 2).

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

Crossrefs

A001519, A054444.

Sequence in context: A005746 A220236 A345954 * A246178 A213164 A278135

Adjacent sequences: A061175 A061176 A061177 * A061179 A061180 A061181

Keyword

nonn,easy

Author

Wolfdieter Lang, Apr 20 2001

Status

approved