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A026551 a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026536. 3
3, 9, 21, 57, 129, 345, 777, 2073, 4665, 12441, 27993, 74649, 167961, 447897, 1007769, 2687385, 6046617, 16124313, 36279705, 96745881, 217678233, 580475289, 1306069401, 3482851737, 7836416409, 20897110425, 47018498457 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

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

FORMULA

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

CROSSREFS

Cf. A026534, A026565.

Sequence in context: A005254 A191796 A007056 * A060578 A147078 A146416

Adjacent sequences:  A026548 A026549 A026550 * A026552 A026553 A026554

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified May 19 22:35 EDT 2013. Contains 225436 sequences.