A059162 A hierarchical sequence (S(W'2{3}*c) - see A059126).
12, 48, 144, 384, 960, 2304, 5376, 12288, 27648, 61440, 135168, 294912, 638976, 1376256, 2949120, 6291456, 13369344, 28311552, 59768832, 125829120, 264241152, 553648128, 1157627904, 2415919104, 5033164800, 10468982784, 21743271936, 45097156608, 93415538688
Offset: 0
Links
- Colin Barker, Table of n, a(n) for n = 0..1000
- J. Wallgren, Hierarchical sequences
- Index entries for linear recurrences with constant coefficients, signature (4,-4).
Programs
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PARI
Vec(12/(2*x-1)^2 + O(x^40)) \\ Colin Barker, Oct 07 2015
Formula
a(n) = 12*A001787(n).
From Colin Barker, Oct 07 2015: (Start)
a(n) = 3*(2^(2+n)*(1+n)).
a(n) = 4*a(n-1)-4*a(n-2) for n>1.
G.f.: 12 / (2*x-1)^2.
(End)