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 A188129 a(n) = (2^n+3)^2-8. 2
 8, 17, 41, 113, 353, 1217, 4481, 17153, 67073, 265217, 1054721, 4206593, 16801793, 67158017, 268533761, 1073938433, 4295360513, 17180655617, 68721049601, 274881052673, 1099517919233, 4398059094017, 17592211210241, 70368794509313, 281475077373953, 1125900108169217, 4503600030023681, 18014399314788353, 72057595648540673 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Daniel Shanks, Gauss's ternary form reduction and the 2-Sylow subgroup, Math. Comp. 25 (1971), 837-853. Index entries for linear recurrences with constant coefficients, signature (7,-14,8). FORMULA a(n) = 7*a(n-1)-14*a(n-2)+8*a(n-3). G.f.: -(34*x^2-39*x+8)/((x-1)*(2*x-1)*(4*x-1)). [Colin Barker, Nov 11 2012] MATHEMATICA (2^Range[0, 30]+3)^2-8 (* or *) LinearRecurrence[{7, -14, 8}, {8, 17, 41}, 30] (* Harvey P. Dale, Nov 23 2012 *) CROSSREFS For primes see A188661 and A188936. Sequence in context: A159696 A049713 A297728 * A041849 A041124 A048695 Adjacent sequences:  A188126 A188127 A188128 * A188130 A188131 A188132 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Apr 14 2011 STATUS approved

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Last modified July 19 22:14 EDT 2019. Contains 325168 sequences. (Running on oeis4.)