id:A027022 - OEIS Search Results

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a(n) = Sum{T(k,n-k)}, k=m,m+1,...,n, where m=[ (n+1)/2 ]; i.e. a(n) is n-th diagonal sum of left-justified array T given by A027011.

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1, 3, 4, 7, 11, 15, 26, 34, 57, 79, 123, 181, 269, 406, 597, 900, 1332, 1991, 2968, 4414, 6596, 9805, 14639, 21792, 32488, 48418, 72130, 107532, 160191, 238776, 355785, 530211, 790156, 1177431, 1754739, 2614807, 3896754 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`G.f.: x(-x^4-3x^3+x^2+3x+1)/[(1-x^2)(1-2x^2-x^3+x^4)].`
	CROSSREFS	`Sequence in context: A050120 A039010 A127208 this_sequence A120365 A060962 A069950` `Adjacent sequences: A027019 A027020 A027021 this_sequence A027023 A027024 A027025`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified July 19 08:04 EDT 2008. Contains 142098 sequences.

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