A027286 - OEIS

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A027286

a(n) = Sum{(k+1)*T(n,k)}, 0<=k<=2n, T given by A026584.

1, 4, 18, 56, 190, 564, 1722, 4976, 14454, 40940, 115698, 322728, 896558, 2471588, 6786090, 18537184, 50459366, 136844892, 370030434, 997705240, 2683514526, 7201203988, 19284880794, 51546789456, 137541880150, 366412976332 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (3x^2+2x+1)/(1-x-4x^2)^2.`
	CROSSREFS	`Sequence in context: A059133 A020644 A181411 * A119044 A058851 A167885` `Adjacent sequences: A027283 A027284 A027285 * A027287 A027288 A027289`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified February 14 01:35 EST 2012. Contains 205567 sequences.