id:A027991 - OEIS Search Results

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a(n)=Sum{T(n,k)*T(n,2n-k)}, 0<=k<=n-1, T given by A027926.

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1, 3, 12, 40, 130, 404, 1227, 3653, 10720, 31090, 89316, 254568, 720757, 2029095, 5684340, 15855964, 44061862, 122032508, 336966015, 927953705, 2549229256, 6987648358, 19115124552, 52194037200, 142274514025, 387215773899 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`(1/5)[nF(2n+2) - nF(2n-2) + F(2n-1) - (-1)^n], F(n)=A000045(n).`
	CROSSREFS	`Sequence in context: A052482 A080929 A061136 this_sequence A120304 A026071 A102839` `Adjacent sequences: A027988 A027989 A027990 this_sequence A027992 A027993 A027994`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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