OFFSET
1,8
COMMENTS
An amazon (superqueen) moves like a queen and a knight
LINKS
FORMULA
G.f.: -12*x^8*(x^3+1)/(x-1)^5.
Explicit formula: a(n) = (n-7)(n^3-21n^2+158n-420), n>=7.
MATHEMATICA
CoefficientList[Series[- 12 x^7 (x^3 + 1) / (x - 1)^5, {x, 0, 50}], x] (* Vincenzo Librandi, May 30 2013 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Mar 25 2010
EXTENSIONS
More terms from Vincenzo Librandi, May 30 2013
STATUS
approved