A171129 - OEIS

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A171129

a(n)=(n^4-n^3-n^2-n)/2.

0, -1, 1, 21, 86, 235, 519, 1001, 1756, 2871, 4445, 6589, 9426, 13091, 17731, 23505, 30584, 39151, 49401, 61541, 75790, 92379, 111551, 133561, 158676, 187175, 219349, 255501, 295946, 341011, 391035, 446369, 507376, 574431, 647921, 728245, 815814 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,4`
	LINKS	`Table of n, a(n) for n=1..37.`
	EXAMPLE	`(2^4 - 2^3 - 2^2 - 2)/2 = 1, (3^4 - 3^3 - 3^2 - 3)/2 = 21,..`
	MATHEMATICA	`f[n_]:=(n^4-n^3-n^2-n)/2; Table[f[n], {n, 0, 5!}]`
	CROSSREFS	`Cf. A152016` `Sequence in context: A063651 A220613 A045016 * A219850 A158540 A219886` `Adjacent sequences: A171126 A171127 A171128 * A171130 A171131 A171132`
	KEYWORD	`sign`
	AUTHOR	`Vladimir Joseph Stephan Orlovsky, Dec 04 2009`
	STATUS	`approved`

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Last modified June 18 22:35 EDT 2013. Contains 226356 sequences.