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 A171129 a(n)=(n^4-n^3-n^2-n)/2. 0
 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 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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