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 A166151 (5n^2 + 5n - 6)/2. 1
 2, 12, 27, 47, 72, 102, 137, 177, 222, 272, 327, 387, 452, 522, 597, 677, 762, 852, 947, 1047, 1152, 1262, 1377, 1497, 1622, 1752, 1887, 2027, 2172, 2322, 2477, 2637, 2802, 2972, 3147, 3327, 3512, 3702, 3897, 4097, 4302, 4512, 4727, 4947, 5172, 5402, 5637 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Index entries for sequences related to linear recurrences with constant coefficients, signature (3,-3,1). FORMULA a(n)=5*n*(n+1)/2-3 = 3*a(n-1) -3*a(n-2) +a(n-3). G.f.: x*(-2-6*x+3*x^2)/(x-1)^3. [From R. J. Mathar, Oct 14 2009] CROSSREFS Sequence in context: A098707 A152811 A102960 * A154149 A119201 A164876 Adjacent sequences:  A166148 A166149 A166150 * A166152 A166153 A166154 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Oct 08 2009 STATUS approved

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