id:A027021 - OEIS Search Results

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a(n) = T(n,n) + T(n,m+1) + ... + T(n,n), where m=[ (n+2)/2 ], T given by A027011.

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1, 1, 6, 7, 36, 56, 181, 317, 826, 1531, 3576, 6832, 15021, 29201, 61966, 121727, 252796, 499816, 1024101, 2033077, 4130226, 8220851, 16609456, 33115232, 66669661, 133067881, 267285606, 533860567, 1070731476, 2139602456 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`G.f.: x(-4x^6+10x^4-x^3-x+1)/[(1-x^2)(1-2x)(1+x-x^2)(1-x-x^2)].`
	CROSSREFS	`Sequence in context: A033043 A037411 A025626 this_sequence A013627 A041080 A042091` `Adjacent sequences: A027018 A027019 A027020 this_sequence A027022 A027023 A027024`
	KEYWORD	`nonn`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu)`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research