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A026647 Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026637. 1
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 (list; graph; refs; listen; history; text; internal format)
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: A036588 A239872 A099517 * A026669 A023614 A001610

Adjacent sequences:  A026644 A026645 A026646 * A026648 A026649 A026650

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 27 01:03 EDT 2018. Contains 303149 sequences. (Running on oeis4.)