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A068940
Maximum number of chess queens that can be placed on a 3-dimensional chessboard of order n so that no two queens attack each other.
4
1, 1, 4, 7, 13, 21, 32, 48, 67, 91, 121, 133, 169
OFFSET
1,3
LINKS
Attacking Queens Programming Contest, Description of the contest.
Eric Weisstein's World of Mathematics, Independence Number.
Al Zimmermann, Attacking Queens Programming Contest, Final report, 2002.
CROSSREFS
KEYWORD
nonn,more,hard
AUTHOR
Al Zimmermann, Mar 08 2002
STATUS
approved