id:A027975 - OEIS Search Results

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a(n) = n-th diagonal sum of left justified array T given by A027960.

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1, 1, 4, 5, 8, 12, 16, 23, 31, 42, 57, 76, 102, 136, 181, 241, 320, 425, 564, 748, 992, 1315, 1743, 2310, 3061, 4056, 5374, 7120, 9433, 12497, 16556, 21933 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: (2x^2+1)/[(1-x)(1-x^2-x^3)].`
	CROSSREFS	`Sequence in context: A066233 A130814 A047609 this_sequence A011980 A061765 A133940` `Adjacent sequences: A027972 A027973 A027974 this_sequence A027976 A027977 A027978`
	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