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A110594
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a(1) = 4, a(2) = 12, for n>1: a(n) = 3*4^(n-1).
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6
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4, 12, 48, 192, 768, 3072, 12288, 49152, 196608, 786432, 3145728, 12582912, 50331648, 201326592, 805306368, 3221225472, 12884901888, 51539607552, 206158430208, 824633720832, 3298534883328, 13194139533312, 52776558133248
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OFFSET
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1,1
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LINKS
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FORMULA
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MAPLE
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seq(coeff(series(4*x*(1-x)/(1-4*x), x, n+1), x, n), n = 1 .. 25); # Muniru A Asiru, Oct 21 2018
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MATHEMATICA
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CoefficientList[Series[4 (1 - x)/(1 - 4 x), {x, 0, 40}], x] (* Vincenzo Librandi, May 29 2014 *)
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PROG
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(PARI) x='x+O('x^50); Vec(4*x*(1 - x)/(1 - 4*x)) \\ G. C. Greubel, Sep 01 2017
(GAP) Concatenation([4], List([2..25], n->3*4^(n-1))); # Muniru A Asiru, Oct 21 2018
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CROSSREFS
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KEYWORD
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easy,less,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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