id:A081423 - OEIS Search Results

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Subdiagonal of array of n-gonal numbers A081422.

+0
2

1, 3, 12, 34, 75, 141, 238, 372, 549, 775, 1056, 1398, 1807, 2289, 2850, 3496, 4233, 5067, 6004, 7050, 8211, 9493, 10902, 12444, 14125, 15951, 17928, 20062, 22359, 24825, 27466, 30288, 33297, 36499, 39900, 43506, 47323, 51357, 55614, 60100 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`One of a family of sequences with palindromic generators.`
	FORMULA	`a(n)=(2n^3+n^2+n+2)/2. G.f.: (1-2x+7x^2-6x^3)/(1-x)^5`
	CROSSREFS	`Cf. A081435, A081436, A081437.` `Sequence in context: A083725 A054610 A117655 this_sequence A060298 A073372 A026573` `Adjacent sequences: A081420 A081421 A081422 this_sequence A081424 A081425 A081426`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 21 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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