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A059162
A hierarchical sequence (S(W'2{3}*c) - see A059126).
1
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
0,1
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)
PROG
(PARI) Vec(12/(2*x-1)^2 + O(x^40)) \\ Colin Barker, Oct 07 2015
CROSSREFS
Sequence in context: A239352 A292022 A265040 * A333032 A190622 A117027
KEYWORD
easy,nonn
AUTHOR
Jonas Wallgren, Feb 02 2001
STATUS
approved