A026647 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026637.

1, 1, 2, 3, 6, 10, 17, 27, 45, 73, 119, 192, 312, 505, 818, 1323, 2142, 3466, 5609, 9075, 14685, 23761, 38447, 62208, 100656, 162865, 263522, 426387, 689910, 1116298, 1806209, 2922507, 4728717, 7651225, 12379943, 20031168

Offset

0,3

Links

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

Formula

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

Crossrefs

Sequence in context: A334893 A239872 A099517 * A026669 A363070 A023614

Adjacent sequences: A026644 A026645 A026646 * A026648 A026649 A026650

Keyword

nonn

Author

Clark Kimberling

Status

approved