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Powers of 2 (cf. A000079) with 1 replaced by 3.
1

%I #6 Jun 29 2023 12:59:50

%S 3,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,

%T 131072,262144,524288,1048576,2097152,4194304,8388608,16777216,

%U 33554432,67108864,134217728,268435456,536870912,1073741824,2147483648,4294967296,8589934592

%N Powers of 2 (cf. A000079) with 1 replaced by 3.

%C First differences of A171449.

%H <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (2).

%F a(n+1)-a(n) = A171449(n).

%F a(n) + A171449(n) = A000079(n+1) = 2*A000079(n).

%F G.f.: (3-4*x)/(1-2*x).

%K nonn,less

%O 0,1

%A _Paul Curtz_, Dec 11 2009

%E Edited by _R. J. Mathar_ and _N. J. A. Sloane_, Dec 15 2009