id:A086689 - OEIS Search Results

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Sum(i=1,n,i^2*t(i)), t(i)=i*(i+1)/2.

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1, 13, 67, 227, 602, 1358, 2730, 5034, 8679, 14179, 22165, 33397, 48776, 69356, 96356, 131172, 175389, 230793, 299383, 383383, 485254, 607706, 753710, 926510, 1129635, 1366911, 1642473, 1960777, 2326612, 2745112 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`n(n+1)(n+2)(12n^2+9n-1)/120.`
	PROGRAM	`(PARI) t(n)=n(n+1)/2 for(i=1, 30, print1(", "sum(j=1, i, j^2t(i))))`
	CROSSREFS	`Sequence in context: A129746 A067863 A106975 this_sequence A141956 A137720 A093119` `Adjacent sequences: A086686 A086687 A086688 this_sequence A086690 A086691 A086692`
	KEYWORD	`nonn`
	AUTHOR	`Jon Perry (perry(AT)globalnet.co.uk), Jul 28 2003`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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