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A026677 T(n,0) + T(n,1) + ... + T(n,n), T given by A026670. 1
1, 2, 5, 10, 23, 46, 103, 206, 455, 910, 1993, 3986, 8679, 17358, 37633, 75266, 162643, 325286, 701075, 1402150, 3015563, 6031126, 12948083, 25896166, 55513327, 111026654, 237705547, 475411094, 1016736115, 2033472230 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..29.

FORMULA

G.f.: F(x^2) + 2xF(x^2), where xF(x) = g.f. of A054441. - Ralf Stephan, Feb 05 2004

CROSSREFS

Partial sums of A026733.

Sequence in context: A007182 A191386 A323988 * A109165 A018344 A284181

Adjacent sequences:  A026674 A026675 A026676 * A026678 A026679 A026680

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified June 12 14:32 EDT 2021. Contains 344957 sequences. (Running on oeis4.)