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 A099721 n^2*(2*n+1). 5
 0, 3, 20, 63, 144, 275, 468, 735, 1088, 1539, 2100, 2783, 3600, 4563, 5684, 6975, 8448, 10115, 11988, 14079, 16400, 18963, 21780, 24863, 28224, 31875, 35828, 40095, 44688, 49619, 54900, 60543, 66560, 72963, 79764, 86975, 94608, 102675, 111188 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 Index to sequences with linear recurrences with constant coefficients, signature (4,-6,4,-1). FORMULA G.f.: x*(3+8*x+x^2)/(x-1)^4. a(n) = A024196(n) - A024196(n-1). - Philippe DelĂ©ham, May 07 2012 MAPLE A099721 := proc(n) n^2*(2*n+1) ; end proc: seq(A099721(n), n=0..10) ; MATHEMATICA a[n_]:=2*n^3+n^2; ...and/or...Array[ #*(#*(2*#+1))&, 5!, 0] [From Vladimir Joseph Stephan Orlovsky, Dec 21 2008] PROG (MAGMA) [n^2*(2*n+1): n in [0..50]]; // Vincenzo Librandi, May 01 2011 CROSSREFS Sequence in context: A143582 A132404 A062359 * A024402 A183377 A067600 Adjacent sequences:  A099718 A099719 A099720 * A099722 A099723 A099724 KEYWORD nonn,easy AUTHOR Douglas Winston (douglas.winston(AT)srupc.com), Nov 07 2004 STATUS approved

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