id:A081435 - OEIS Search Results

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Diagonal in array of n-gonal numbers A081422.

+0
5

1, 5, 18, 46, 95, 171, 280, 428, 621, 865, 1166, 1530, 1963, 2471, 3060, 3736, 4505, 5373, 6346, 7430, 8631, 9955, 11408, 12996, 14725, 16601, 18630, 20818, 23171, 25695, 28396, 31280, 34353, 37621, 41090, 44766, 48655, 52763, 57096, 61660 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`One of a family of sequences with palindromic generators.`
	FORMULA	`a(n)=(2n^3+3n^2+3n+2)/2. G.f.: (1+3x^2-4x^3)/(1-x)^5`
	CROSSREFS	`Cf. A081434, A081436, A081437.` `Sequence in context: A037140 A007237 A000339 this_sequence A109363 A036893 A125641` `Adjacent sequences: A081432 A081433 A081434 this_sequence A081436 A081437 A081438`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 21 2003`

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Last modified September 5 23:56 EDT 2008. Contains 143485 sequences.

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