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 A020542 a(n) = 5th Chebyshev polynomial (second kind) evaluated at 2^n. 1
 6, 780, 30744, 1032240, 33423456, 1072693440, 34351350144, 1099444519680, 35183835219456, 1125895611878400, 36028762659231744, 1152921229728952320, 36893485948395872256, 1180591603125225308160, 37778931722219673452544, 1208925818488729268060160 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Colin Barker, Table of n, a(n) for n = 0..663 Index entries for linear recurrences with constant coefficients, signature (42,-336,512). FORMULA From Colin Barker, May 03 2015: (Start)   a(n) = 2^(1+n)*(3-4^(2+n)+16^(1+n))   a(n) = 42*a(n-1)-336*a(n-2)+512*a(n-3) for n>2.   G.f.: -6*(88*x+1) / ((2*x-1)*(8*x-1)*(32*x-1)). (End) MAPLE with(orthopoly):seq(U(5, 2^i), i=0..24); MATHEMATICA Table[ChebyshevU[5, 2^n], {n, 1, 40}] (* Vladimir Joseph Stephan Orlovsky, Nov 03 2009 *) LinearRecurrence[{42, -336, 512}, {6, 780, 30744}, 16] (* Jean-François Alcover, Dec 04 2017 *) PROG (PARI) Vec(-6*(88*x+1)/((2*x-1)*(8*x-1)*(32*x-1)) + O(x^100)) \\ Colin Barker, May 03 2015 (PARI) a(n) = polchebyshev(5, 2, 2^n) \\ Michel Marcus, May 03 2015 CROSSREFS Sequence in context: A214009 A088217 A242850 * A045480 A006114 A321426 Adjacent sequences:  A020539 A020540 A020541 * A020543 A020544 A020545 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified December 6 14:15 EST 2019. Contains 329806 sequences. (Running on oeis4.)