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 A153056 a(0)=2, a(n) = n^2+a(n-1). 8
 2, 3, 7, 16, 32, 57, 93, 142, 206, 287, 387, 508, 652, 821, 1017, 1242, 1498, 1787, 2111, 2472, 2872, 3313, 3797, 4326, 4902, 5527, 6203, 6932, 7716, 8557, 9457, 10418, 11442, 12531, 13687, 14912, 16208, 17577, 19021, 20542, 22142, 23823, 25587 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Shawn A. Broyles, Table of n, a(n) for n = 0..1000 FORMULA G.f.: (2-5x+7x^2-2x^3)/(1-x)^4. a(n)=2+n(1+2n^2+3n)/6 = 2+A000330(n). - R. J. Mathar, Jan 08 2009 MATHEMATICA a=2; lst={}; Do[a=n^2+a; AppendTo[lst, a], {n, 0, 5!}]; lst PROG (PARI) a(n) = n*(n+1)*(2*n+1)/6 + 2; \\ Altug Alkan, Apr 30 2018 CROSSREFS Cf. A056520 Sequence in context: A004782 A049956 A289844 * A235112 A081207 A027118 Adjacent sequences:  A153053 A153054 A153055 * A153057 A153058 A153059 KEYWORD nonn,easy AUTHOR Vladimir Joseph Stephan Orlovsky, Dec 17 2008 STATUS approved

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Last modified March 21 04:59 EDT 2019. Contains 321364 sequences. (Running on oeis4.)