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A026624 a(n) = Sum{T(i,j)}, 0<=i<=n, 0<=j<=n, T given by A026615. 1
1, 3, 8, 20, 46, 100, 210, 432, 878, 1772, 3562, 7144, 14310, 28644, 57314, 114656, 229342, 458716, 917466, 1834968, 3669974, 7339988, 14680018, 29360080, 58720206, 117440460, 234880970, 469761992, 939524038, 1879048132 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

FORMULA

G.f.: (1-x+x^2+x^3)/[(1-x)^2*(1-2x)] (conjectured). Cf. A026622. - Ralf Stephan, Feb 05 2004

CROSSREFS

Sequence in context: A191522 A140481 A027928 * A026690 A036676 A101533

Adjacent sequences:  A026621 A026622 A026623 * A026625 A026626 A026627

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 25 14:40 EST 2022. Contains 350572 sequences. (Running on oeis4.)