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A151746
G.f.: (1-2*x-5*x^2+4*x^3)/((1-4*x)*(1-x)^2).
1
1, 4, 10, 32, 118, 460, 1826, 7288, 29134, 116516, 466042, 1864144, 7456550, 29826172, 119304658, 477218600, 1908874366, 7635497428, 30541989674, 122167958656, 488671834582, 1954687338284, 7818749353090, 31274997412312, 125099989649198, 500399958596740
OFFSET
0,2
FORMULA
a(n) = 14/9+2*n/3+4^(n+1)/9, n>0. [From R. J. Mathar, Jun 17 2009]
MATHEMATICA
CoefficientList[Series[(1-2x-5x^2+4x^3)/((1-4x)(1-x)^2), {x, 0, 30}], x] (* Harvey P. Dale, Jan 13 2015 *)
CROSSREFS
Subsequence of A151735 at powers of 2.
Sequence in context: A137954 A028283 A196991 * A110145 A185631 A174520
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 16 2009
STATUS
approved