OFFSET
0,2
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..200
MATHEMATICA
CoefficientList[Series[1/((1-x)(1-3x)(1-9x)(1-12x)), {x, 0, 25}], x] (* Harvey P. Dale, Feb 24 2011 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved