A260189 - OEIS

%I #11 Jul 22 2015 23:07:59

%S 1,0,0,1,1,0,0,0,0,0,0,1,1,0,0,4,8,0,0,15,22,0,0,52,51,0,0,257,342,0,

%T 0,1589,2609,0,0,11417,16896,0,0,75375,99114,0,0,616010,876579,0,0,

%U 5253278,8551800,0,0,49667373,79595269,0,0,525731268,764804085,0,0,5932910966,8905825760,0,0

%N a(n) = A033148(n) / 2^floor(n/4).

%D W. Ahrens, Mathematische Unterhaltungen und Spiele, 2nd edition, volume 1, Teubner, 1910, pages 249-258.

%D Maurice Kraitchik, Le probleme des reines, Bruxelles: L'Échiquier, 1926, 18.

%H P. Capstick and K. McCann, <a href="/A000170/a000170_1.pdf">The problem of the n queens</a>, apparently unpublished, no date (circa 1990?) [Scanned copy]

%Y Cf. A002562, A032522, A033148, A037223, A037224.

%K nonn,hard

%O 1,16

%A _Vaclav Kotesovec_, following a suggestion of _Don Knuth_, Jul 18 2015