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 A343176 a(0)=3; for n > 0, a(n) = 2^(2*n) + 3*2^(n-1) + 1. 2
 3, 8, 23, 77, 281, 1073, 4193, 16577, 65921, 262913, 1050113, 4197377, 16783361, 67121153, 268460033, 1073790977, 4295065601, 17180065793, 68719869953, 274878693377, 1099513200641, 4398049656833, 17592192335873, 70368756760577, 281475001876481, 1125899957174273, 4503599728033793 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A bisection of A257418. Apart from first term, same as A036562. LINKS Index entries for linear recurrences with constant coefficients, signature (7,-14,8). FORMULA From Chai Wah Wu, Apr 26 2021: (Start) a(n) = 7*a(n-1) - 14*a(n-2) + 8*a(n-3) for n > 3. G.f.: -(4*x - 3)*(x^2 + 3*x - 1)/((x - 1)*(2*x - 1)*(4*x - 1)). (End) CROSSREFS Cf. A257418, A036562, A343175. Sequence in context: A024716 A189359 A125782 * A307875 A321730 A047143 Adjacent sequences:  A343173 A343174 A343175 * A343177 A343178 A343179 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Apr 26 2021 EXTENSIONS a(17)-a(26) from Martin Ehrenstein, Apr 26 2021 STATUS approved

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Last modified September 21 01:46 EDT 2021. Contains 347596 sequences. (Running on oeis4.)