id:A027276 - OEIS Search Results

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a(n) = Sum{(k+1)*T(n,k)}, 0<=k<=2n, T given by A026552.

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1, 6, 27, 72, 270, 648, 2268, 5184, 17496, 38880, 128304, 279936, 909792, 1959552, 6298560, 13436928, 42830208, 90699264, 287214336, 604661760, 1904684544, 3990767616, 12516498432, 26121388032, 81629337600, 169789022208 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1+6x+15x^2-18x^3)/(1-6x^2)^2.`
	CROSSREFS	`Sequence in context: A012720 A012365 A085788 this_sequence A101970 A136105 A027313` `Adjacent sequences: A027273 A027274 A027275 this_sequence A027277 A027278 A027279`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified December 3 16:57 EST 2008. Contains 151279 sequences.

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