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 A176635 a(n) = 6*a(n-1)-8*a(n-2) for n > 1; a(0) = 57, a(1) = 242. 6

%I

%S 57,242,996,4040,16272,65312,261696,1047680,4192512,16773632,67101696,

%T 268421120,1073713152,4294909952,17179754496,68719247360,274877448192,

%U 1099510710272,4398044676096,17592182374400,70368736837632

%N a(n) = 6*a(n-1)-8*a(n-2) for n > 1; a(0) = 57, a(1) = 242.

%C Related to Reverse and Add trajectory of 77 in base 2: a(n) = A075253(4*n+3)/12, i.e., one twelfth of fourth quadrisection of A075253.

%C Second binomial transform of 57 followed by 128*A000079.

%C Third binomial transform of A176636.

%H Vincenzo Librandi, <a href="/A176635/b176635.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = 64*4^n-7*2^n.

%F G.f.: (57-100*x)/((1-2*x)*(1-4*x)).

%t CoefficientList[Series[(57 - 100 x)/((1 - 2 x) (1 - 4 x)), {x, 0, 40}], x] (* _Vincenzo Librandi_, Sep 24 2013 *)

%t LinearRecurrence[{6,-8},{57,242},30] (* _Harvey P. Dale_, Jun 08 2016 *)

%o (PARI) {m=21; v=concat([57, 242], vector(m-2)); for(n=3, m, v[n]=6*v[n-1]-8*v[n-2]); v}

%o (MAGMA) [64*4^n-7*2^n: n in [0..25]]; // _Vincenzo Librandi_, Sep 24 2013

%Y Cf. A075253 (Reverse and Add trajectory of 77 in base 2), A176632, A176633, A176634, A176636 (repeat 57, 71), A171472.

%K nonn

%O 0,1

%A _Klaus Brockhaus_, Apr 22 2010

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Last modified August 18 10:08 EDT 2022. Contains 356204 sequences. (Running on oeis4.)