id:A062026 - OEIS Search Results

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A062026

a(n) = n(n+1)(n^2 -3n +6)/4

+0
2

0, 2, 6, 18, 50, 120, 252, 476, 828, 1350, 2090, 3102, 4446, 6188, 8400, 11160, 14552, 18666, 23598, 29450, 36330, 44352, 53636, 64308, 76500, 90350, 106002, 123606, 143318, 165300, 189720, 216752, 246576, 279378, 315350, 354690, 397602, 444296 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`a(n) = 123 + 234 + 345 +. . .+ (n-2)(n-1)n +(n-1)n1+ n12, the sum of the cyclic product of terms taken three at a time, final term being n12=2n.`
	EXAMPLE	`a(4) = 123 + 234 + 341 + 412 = 50.`
	CROSSREFS	`Equals 2 * A004255.` `Sequence in context: A002529 A018027 A059413 this_sequence A048495 A089380 A081154` `Adjacent sequences: A062023 A062024 A062025 this_sequence A062027 A062028 A062029`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jun 02 2001`
	EXTENSIONS	`More terms from Larry Reeves (larryr(AT)acm.org), Jun 06 2001`

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

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