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 A139581 a(n) = n*(2*n + 19). 5
 0, 21, 46, 75, 108, 145, 186, 231, 280, 333, 390, 451, 516, 585, 658, 735, 816, 901, 990, 1083, 1180, 1281, 1386, 1495, 1608, 1725, 1846, 1971, 2100, 2233, 2370, 2511, 2656, 2805, 2958, 3115, 3276, 3441, 3610, 3783, 3960, 4141 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..41. Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n) = 2*n^2 + 19*n. a(n) = a(n-1) + 4*n + 17 (with a(0)=0). - Vincenzo Librandi, Nov 24 2010 MATHEMATICA Table[n(2n+19), {n, 0, 50}] (* Harvey P. Dale, Jan 26 2011 *) PROG (PARI) a(n)=n*(2*n+19) \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A014105, A014106, A033537, A130861, A139576, A139577, A139578, A139579, A139580. Sequence in context: A199767 A044098 A044479 * A250777 A327302 A156966 Adjacent sequences: A139578 A139579 A139580 * A139582 A139583 A139584 KEYWORD easy,nonn AUTHOR Omar E. Pol, May 19 2008 STATUS approved

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Last modified September 9 14:01 EDT 2024. Contains 375764 sequences. (Running on oeis4.)