OFFSET
0,2
COMMENTS
Hankel transform of A168058 is (-1)^n*a(n).
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (2,0,8,-16).
FORMULA
a(n) = 2^n*A168056(n).
MATHEMATICA
CoefficientList[Series[(1+8x^2+8x^3)/((1-2x)^2(1+2x+4x^2)), {x, 0, 50}], x] (* Harvey P. Dale, Mar 24 2011 *)
LinearRecurrence[{2, 0, 8, -16}, {1, 2, 12, 40}, 50] (* G. C. Greubel, Jul 08 2016 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Nov 17 2009
STATUS
approved