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A026583 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026568. 2
1, 4, 11, 30, 77, 200, 511, 1314, 3361, 8620, 22067, 56550, 144821, 371024, 950311, 2434410, 6235657, 15973300, 40915931, 104809134, 268472861, 687709400, 1761600847, 4512438450, 11558841841, 29608595644, 75843963011 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

G.f.: (1+2x)/[(1-x)(1-x-4x^2)] (conjectured). - Ralf Stephan, Feb 04 2004

CROSSREFS

Cf. A006131, A026581.

Sequence in context: A296262 A102281 A269083 * A339739 A291238 A110034

Adjacent sequences:  A026580 A026581 A026582 * A026584 A026585 A026586

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 1 06:45 EDT 2021. Contains 346384 sequences. (Running on oeis4.)