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 A017642 a(n) = (12*n+10)^2. 2
 100, 484, 1156, 2116, 3364, 4900, 6724, 8836, 11236, 13924, 16900, 20164, 23716, 27556, 31684, 36100, 40804, 45796, 51076, 56644, 62500, 68644, 75076, 81796, 88804, 96100, 103684, 111556, 119716 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA From Wesley Ivan Hurt, Dec 22 2020: (Start) G.f.: 4*(25 + 46*x + x^2)/(1 - x)^3. a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n >= 3. a(n) = 144*n^2 + 240*n + 100. a(n) = A017641(n)^2. (End) EXAMPLE a(5) = (12*5+10)^2 = 70^2 = 4900. MATHEMATICA (12*Range[0, 30]+10)^2 (* or *) LinearRecurrence[{3, -3, 1}, {100, 484, 1156}, 30] (* Harvey P. Dale, May 08 2017 *) CoefficientList[Series[4*(25 + 46 x + x^2)/(1 - x)^3, {x, 0, 40}], x] (* Wesley Ivan Hurt, Dec 22 2020 *) PROG (PARI) a(n)=(12*n+10)^2 \\ Charles R Greathouse IV, Jun 17 2017 (MAGMA) [(12*n+10)^2 : n in [0..40]]; // Wesley Ivan Hurt, Dec 22 2020 CROSSREFS Cf. A016969, A016970, A017641, A017643. Sequence in context: A334707 A017510 A290654 * A093004 A003588 A115695 Adjacent sequences:  A017639 A017640 A017641 * A017643 A017644 A017645 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified April 14 01:49 EDT 2021. Contains 342941 sequences. (Running on oeis4.)