OFFSET
1,3
COMMENTS
A wazir is a leaper [0,1].
LINKS
V. Kotesovec, Non-attacking chess pieces, 6ed, p.402
FORMULA
a(n) = n^2*(n^4-15*n^2+62)/6, n>=4.
G.f.: -2*x^3 * (3*x^7 - 15*x^6 + 25*x^5 - 7*x^4 - 17*x^3 - 15*x^2 + 83*x + 3)/(x-1)^7.
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Nov 28 2011
STATUS
approved