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.

1, 1, 4, 7, 13, 21, 32, 48, 67, 91, 121, 133, 169

Offset: 1

Author

Al Zimmermann, Mar 08 2002

Keywords

• nonn
• more
• hard

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.
• Attacking Queens Programming Contest Database [broken link]

Crossrefs

Cf. A068941, A115992, A375103.