A026658 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026648.

1, 1, 2, 4, 6, 11, 17, 30, 47, 86, 133, 242, 375, 679, 1054, 1914, 2968, 5389, 8357, 15166, 23523, 42698, 66221, 120204, 186425, 338381, 524806, 952592, 1477398, 2681683, 4159081, 7549278, 11708359, 21252226, 32960585, 59827870

Offset

0,3

Links

Table of n, a(n) for n=0..35.

Formula

G.f.: (-x^6+2x^5+x^4+2x^3+x+1)/(x^8-4x^6-x^4-2x^2+1).

Crossrefs

Sequence in context: A034297 A326495 A026636 * A138688 A131298 A168445

Adjacent sequences: A026655 A026656 A026657 * A026659 A026660 A026661

Keyword

nonn

Author

Clark Kimberling

Status

approved