id:A081438 - OEIS Search Results

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Diagonal in array of n-gonal numbers A081422.

+0
4

1, 11, 36, 82, 155, 261, 406, 596, 837, 1135, 1496, 1926, 2431, 3017, 3690, 4456, 5321, 6291, 7372, 8570, 9891, 11341, 12926, 14652, 16525, 18551, 20736, 23086, 25607, 28305, 31186, 34256, 37521, 40987, 44660, 48546, 52651, 56981, 61542, 66340 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`One of a family of sequences with palindromic generators.`
	FORMULA	`a(n)=(2n^3+9n^2+9n+2)/2. G.f. (1+6x-9x^2+2x^3)/(1-x)^5.`
	CROSSREFS	`Cf. A081436, A081437, A081441.` `Sequence in context: A044469 A015246 A093500 this_sequence A160483 A034309 A006505` `Adjacent sequences: A081435 A081436 A081437 this_sequence A081439 A081440 A081441`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 21 2003`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.

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