OFFSET
0,3
COMMENTS
The published g.f. should be multiplied by -1.
LINKS
M. H. Albert and M. D. Atkinson, Simple permutations and pattern restricted permutations, Discr. Math., 300 (2005), 1-15.
MATHEMATICA
CoefficientList[ Series[ -x*(x^6 + 3*x^5 + 2*x^4 - 2*x^3 - 4*x^2 + 4*x - 1)/((1 - x)^2*(1 - 2*x - x^2)^2), {x, 0, 30}], x] (* Robert G. Wilson v, Oct 15 2005 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 14 2005
STATUS
approved