id:A026551 - OEIS Search Results

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a(n) = Sum{T(i,j)}, 0<=j<=i, 0<=i<=2n, T given by A026536.

+0
4

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; listen)

	OFFSET	`0,1`
	FORMULA	`G.f.: (1+2x-2x^2)/[(1-x)(1-6x^2)]. - Ralf Stephan, Feb 03 2004`
	CROSSREFS	`Cf. A026534, A026565.` `Sequence in context: A109755 A005254 A007056 this_sequence A060578 A147078 A146416` `Adjacent sequences: A026548 A026549 A026550 this_sequence A026552 A026553 A026554`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 20 00:58 EST 2009. Contains 171054 sequences.

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