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%I #7 Apr 04 2016 16:14:04
%S 0,0,28,136,360,696,1144,1704,2376,3160,4056,5064,6184,7416,8760,
%T 10216,11784,13464,15256,17160,19176,21304,23544,25896,28360,30936,
%U 33624,36424,39336,42360,45496,48744,52104,55576,59160
%N Number of 3-step one or two space at a time bishop's tours on an n X n board summed over all starting positions
%C Row 3 of A187046
%F Empirical: a(n) = 56*n^2 - 280*n + 360 for n>3
%e Some solutions for 4X4
%e ..0..0..0..0....0..0..1..0....3..0..1..0....0..0..0..0....0..3..0..0..
%e ..0..0..1..0....0..0..0..0....0..2..0..0....0..0..1..0....0..0..0..0..
%e ..0..2..0..0....2..0..0..0....0..0..0..0....0..3..0..0....0..0..0..2..
%e ..3..0..0..0....0..3..0..0....0..0..0..0....2..0..0..0....0..0..1..0..
%K nonn
%O 1,3
%A _R. H. Hardin_ Mar 02 2011
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