OFFSET
1,2
COMMENTS
Zebra is a (fairy chess) leaper [2,3].
LINKS
V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p.363
Wikipedia, Fairy chess piece
FORMULA
a(n) ~ n^(2*n)/n! * exp(-9/2).
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Vaclav Kotesovec, Jun 25 2014
STATUS
approved