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A026534 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026519. 3
1, 4, 10, 28, 64, 172, 388, 1036, 2332, 6220, 13996, 37324, 83980, 223948, 503884, 1343692, 3023308, 8062156, 18139852, 48372940, 108839116, 290237644, 653034700, 1741425868, 3918208204, 10448555212, 23509249228, 62691331276 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..28.

FORMULA

G.f.: [x(1+3x)]/[(1-x)(1-6x^2)]. - Ralf Stephan, Feb 03 2004

CROSSREFS

Cf. A026532, A026551.

Sequence in context: A092504 A038579 A133726 * A034920 A274597 A203293

Adjacent sequences:  A026531 A026532 A026533 * A026535 A026536 A026537

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified November 19 08:44 EST 2019. Contains 329318 sequences. (Running on oeis4.)