id:A050533 - OEIS Search Results

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Thickened pyramidal numbers: a(n)=sum(4*i*(i-1)+1,i = 1 .. n) + 2*(n+1)*n.

+0
3

0, 5, 22, 59, 124, 225, 370, 567, 824, 1149, 1550, 2035, 2612, 3289, 4074, 4975, 6000, 7157, 8454, 9899, 11500, 13265, 15202, 17319, 19624, 22125, 24830, 27747, 30884, 34249, 37850, 41695, 45792, 50149, 54774, 59675, 64860, 70337, 76114, 82199 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=1/3n(5+6n+4n^2)=binomial(2n+1, 3)+2(n+1)n=A000447(n)+4A000217(n)`
	CROSSREFS	`A000292, A000447, A000217, A050492.` `Adjacent sequences: A050530 A050531 A050532 this_sequence A050534 A050535 A050536` `Sequence in context: A099078 A049452 A033445 this_sequence A064836 A032168 A000345`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 29 1999`

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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