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 A281482 a(n) = 2^(n + 1) * (2^n + 1) - 1. 4
 3, 11, 39, 143, 543, 2111, 8319, 33023, 131583, 525311, 2099199, 8392703, 33562623, 134234111, 536903679, 2147549183, 8590065663, 34360000511, 137439477759, 549756862463, 2199025352703, 8796097216511, 35184380477439, 140737505132543, 562949986975743 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Colin Barker, Table of n, a(n) for n = 0..1000 Index entries for linear recurrences with constant coefficients, signature (7,-14,8). FORMULA From Colin Barker, Jan 22 2017: (Start) a(n) = 7*a(n-1) - 14*a(n-2) + 8*a(n-3) for n>2. G.f.: (3 - 10*x + 4*x^2) / ((1 - x)*(1 - 2*x)*(1 - 4*x)). (End) PROG (MAGMA) [2^(n + 1) * (2^n + 1) - 1: n in [0..200]] (PARI) Vec((3 - 10*x + 4*x^2) / ((1 - x)*(1 - 2*x)*(1 - 4*x)) + O(x^30)) \\ Colin Barker, Jan 22 2017 CROSSREFS Similar sequences: A085601 (2^(n + 1) * (2^n + 1) + 1), A092431 (2^(n - 1) * (2^n + 1) - 1), A092440 (2^(n + 1) * (2^n - 1) + 1), A129868 (2^(n - 1) * (2^n - 1) - 1), A134169 (2^(n - 1) * (2^n - 1) + 1), A267816 (2^(n + 1) * (2^n - 1) - 1), A281481 (2^(n - 1) * (2^n + 1) + 1). Sequence in context: A007482 A134760 A257290 * A132889 A245390 A149061 Adjacent sequences:  A281479 A281480 A281481 * A281483 A281484 A281485 KEYWORD nonn,easy AUTHOR Jaroslav Krizek, Jan 22 2017 STATUS approved

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Last modified August 5 07:25 EDT 2020. Contains 336209 sequences. (Running on oeis4.)