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A026599 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026584. 2
1, 3, 9, 23, 61, 155, 401, 1023, 2629, 6723, 17241, 44135, 113101, 289643, 742049, 1900623, 4868821, 12471315, 31946601, 81831863, 209618269, 536945723, 1375418801, 3523201695, 9024876901, 23117683683, 59217191289, 151687926023 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..27.

FORMULA

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

CROSSREFS

Cf. A006131, A026581.

Sequence in context: A180488 A318860 A318818 * A061647 A207008 A077996

Adjacent sequences:  A026596 A026597 A026598 * A026600 A026601 A026602

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified October 1 04:06 EDT 2020. Contains 337441 sequences. (Running on oeis4.)