A067989 Row sums of triangle A067979; also of triangle A067990.

1, 9, 34, 95, 240, 553, 1212, 2547, 5195, 10340, 20184, 38766, 73451, 137565, 255080, 468877, 855288, 1549583, 2790510, 4997895, 8907481, 15804634, 27928464, 49169100, 86268325, 150882993, 263124862

Offset

0,2

Links

Table of n, a(n) for n=0..26.

Formula

a(n)= (n+2)*((3*n+1)*F(n-1)/2+(2*n+1)*F(n)), with F(n) := A000045(n) (Fibonacci).

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

Crossrefs

Sequence in context: A014816 A147691 A000441 * A002881 A268803 A250652

Adjacent sequences: A067986 A067987 A067988 * A067990 A067991 A067992

Keyword

nonn,easy

Author

Wolfdieter Lang, Feb 15 2002

Status

approved