OFFSET
3,2
COMMENTS
a(n) = 0 if N does not achieve 2*floor(2n/3).
REFERENCES
M. Gardner, The Last Recreations, Springer, 1997, p. 282.
M. Gardner, The Colossal Book of Mathematics, 2001, p. 209.
LINKS
Martin Gardner, The Last Recreations, 1997
Vaclav Kotesovec, The unique solution for chessboard 9 X 9
Manfred Scheucher, C Code
CROSSREFS
KEYWORD
nonn,more,nice
AUTHOR
EXTENSIONS
Description corrected by and one more term from Jud McCranie, Aug 25 2001
STATUS
approved