A027281 - OEIS

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A027281

a(n) = Sum{(k+1)*T(n,k)}, 0<=k<=2n, T given by A026568.

1, 6, 21, 76, 235, 738, 2177, 6424, 18423, 52590, 147917, 413796, 1147523, 3166842, 8689305, 23745584, 64621199, 175277574, 473909989, 1277864060, 3436938267, 9223203858, 24699503281, 66020102472, 176160084775, 469293598878 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (2x^2+4x+1)/(1-x-4x^2)^2.`
	CROSSREFS	`Sequence in context: A200665 A200466 A200249 * A006814 A108136 A054625` `Adjacent sequences: A027278 A027279 A027280 * A027282 A027283 A027284`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.