%I A051223
%S A051223 1,0,0,0,0,0,0,0,0,4,44,156,1876,5180,32516,202900,1330622,8924976,
%T A051223 64492432,495864256,3977841852,34092182276,306819842212,2883202816808,
%U A051223 28144109776812
%N A051223 Number of ways of placing n nonattacking superqueens on an n X n board.
%C A051223 A superqueen moves like a queen and a knight.
%C A051223 A linear time algorithm giving an explicit solution for any n >= 10 for 
               the n-super-queens-problem can be found at the link. Included is 
               an online solver, implemented in Javascript. - Frank Schwellinger 
               (nummer_eins(AT)web.de), Mar 19 2004
%H A051223 Anonymous, <a href="http://www.oprisch.com/SuperQueens/SuperQueens.html">
               N x N SuperQueens Solutions Table</a>
%H A051223 D. Bill, <a href="http://www.durangobill.com/N_Queens.html">Durango Bill's 
               The N-Queens Problem</a>
%H A051223 F. Schwellinger, <a href="http://super.info.ms">Explicit Solution To 
               the N-Super-Queens Problem</a>.
%H A051223 W. Schubert, <a href="http://m29s20.vlinux.de/~wschub/nqueen.html">N-Queens 
               page</a> [From W. Schubert (wschubnq(AT)gmx.de), Jul 31 2009]
%Y A051223 Cf. A051224, A000170.
%Y A051223 Sequence in context: A102388 A071125 A053314 this_sequence A077435 A074751 
               A129551
%Y A051223 Adjacent sequences: A051220 A051221 A051222 this_sequence A051224 A051225 
               A051226
%K A051223 nonn,more,new
%O A051223 1,10
%A A051223 Ulrich Schimke (ulrschimke(AT)aol.com)
%E A051223 a(20) from Bill link added Jul 25 2006
%E A051223 Three further terms supplied by Max Alekseyev from the "Anonymous" link.
%E A051223 Added a(24). - W. Schubert (wschubnq(AT)gmx.de), Jul 31 2009
%E A051223 Added a(25). W. Schubert (wschubnq(AT)gmx.de), Nov 29 2009