id:A081492 - OEIS Search Results

Search: id:A081492

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Sum of terms in n-th row of A081491.

+0
4

1, 5, 18, 54, 135, 291, 560, 988, 1629, 2545, 3806, 5490, 7683, 10479, 13980, 18296, 23545, 29853, 37354, 46190, 56511, 68475, 82248, 98004, 115925, 136201, 159030, 184618, 213179, 244935, 280116, 318960, 361713, 408629, 459970, 516006, 577015 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`For odd n a(n) is a multiple of n and a(n)/n is the middle term of the corresponding row.`
	FORMULA	`n/3 * (2n^3 - 6n^2 + 13n - 3).`
	CROSSREFS	`Cf. A002522, A005408, A081489, A081490, A081491.` `Sequence in context: A006479 A127983 A056782 this_sequence A011845 A099450 A145129` `Adjacent sequences: A081489 A081490 A081491 this_sequence A081493 A081494 A081495`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2003`
	EXTENSIONS	`More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 29 2003`

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Last modified December 20 16:54 EST 2009. Contains 171081 sequences.

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