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 A302942 a(n) = (2^n-1)^2*(2^n + 2). 1
 0, 4, 54, 490, 4050, 32674, 261954, 2096770, 16776450, 134216194, 1073738754, 8589928450, 68719464450, 549755789314, 4398046461954, 35184371990530, 281474976514050, 2251799813292034, 18014398508695554, 144115188074283010, 1152921504603701250, 9223372036848484354 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(n) is also the number of total dominating sets in the complete tripartite graph K_{n,n,n} for n > 0. LINKS Eric Weisstein's World of Mathematics, Complete Tripartite Graph Eric Weisstein's World of Mathematics, Total Dominating Set Index entries for linear recurrences with constant coefficients, signature (11,-26,16). FORMULA a(n) = A291703(n) for n > 1. a(n) = 11*a(n-1) - 26*a(n-2) + 16*a(n-3). G.f.: -2*x*(2 + 5*x)/(-1 + 11*x - 26*x^2 + 16*x^3). MATHEMATICA Table[(2^n - 1)^2 (2^n + 2), {n, 0, 30}] LinearRecurrence[{11, -26, 16}, {4, 54, 490}, {0, 20}] CoefficientList[Series[-((2 x (2 + 5 x))/(-1 + 11 x - 26 x^2 + 16 x^3)), {x, 0, 20}], x] CROSSREFS Cf. A291703. Sequence in context: A001545 A208954 A269507 * A292305 A073863 A269480 Adjacent sequences:  A302939 A302940 A302941 * A302943 A302944 A302945 KEYWORD nonn AUTHOR Eric W. Weisstein, Apr 16 2018 STATUS approved

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Last modified May 29 09:16 EDT 2020. Contains 334697 sequences. (Running on oeis4.)