id:A051943 - OEIS Search Results

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A051943

Truncated triangular pyramid numbers: a(n)=sum(k*(k+1)/2-45,k=9..n).

+0
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0, 10, 31, 64, 110, 170, 245, 336, 444, 570, 715, 880, 1066, 1274, 1505, 1760, 2040, 2346, 2679, 3040, 3430, 3850, 4301, 4784, 5300, 5850, 6435, 7056, 7714, 8410, 9145, 9920, 10736, 11594, 12495, 13440, 14430, 15466, 16549, 17680, 18860, 20090 (list; graph; listen)

	OFFSET	`9,2`
	FORMULA	`a(n)=1/6(n+20)(n-8)*(n-9)`
	CROSSREFS	`A000292.` `Sequence in context: A063154 A100500 A085473 this_sequence A059306 A163655 A041190` `Adjacent sequences: A051940 A051941 A051942 this_sequence A051944 A051945 A051946`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 21 1999`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

AT&T Labs Research