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 A017138 a(n) = (8*n+6)^2. 4
 36, 196, 484, 900, 1444, 2116, 2916, 3844, 4900, 6084, 7396, 8836, 10404, 12100, 13924, 15876, 17956, 20164, 22500, 24964, 27556, 30276, 33124, 36100, 39204, 42436, 45796, 49284, 52900, 56644, 60516, 64516, 68644, 72900, 77284, 81796, 86436, 91204, 96100, 101124 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..10000 Index entries for linear recurrences with constant coefficients, signature (3,-3,1). FORMULA G.f.: ( -36-88*x-4*x^2 ) / (x-1)^3. - R. J. Mathar, Aug 26 2015 From Amiram Eldar, Apr 26 2023: (Start) a(n) = A017137(n)^2. a(n) = 2^2*A016838(n). Sum_{n>=0} 1/a(n) = Pi^2/64 - G/8, where G is Catalan's constant (A006752). (End) MATHEMATICA Table[(8*n + 6)^2, {n, 0, 30}] (* Amiram Eldar, Apr 26 2023 *) PROG (Magma) [(8*n+6)^2: n in [0..35]]; // Vincenzo Librandi, Jul 22 2011 (PARI) a(n)=(8*n+6)^2 \\ Charles R Greathouse IV, Jun 17 2017 CROSSREFS Cf. A006752, A016838, A017137. Sequence in context: A211753 A211764 A255093 * A339981 A304378 A120465 Adjacent sequences: A017135 A017136 A017137 * A017139 A017140 A017141 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified December 7 22:54 EST 2023. Contains 367662 sequences. (Running on oeis4.)