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%I #15 Nov 21 2019 22:14:35
%S 1,1,4,7,13,21,32,48,67,91,121,133,169
%N Maximal number of chess queens that can be placed on a 3-dimensional chessboard of order n so that no two queens attack each other.
%H <a href="http://web.archive.org/web/20050316123203/http://members.aol.com/Bitzenbeitz/Contests/AttackingQueens/Description.html">Attacking Queens Programming Contest</a>, Description of the contest.
%H Al Zimmermann, <a href="http://recmath.com/contest/AttackingQueens/FinalReport.html">Attacking Queens Programming Contest</a>, Final report, 2002.
%H <a href="http://groups.yahoo.com/group/AttackingQueens/database">Attacking Queens Programming Contest Database</a> [broken link]
%Y Cf. A068941, A115992.
%K nonn
%O 1,3
%A _Al Zimmermann_, Mar 08 2002
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