%I #18 Sep 27 2013 14:14:41
%S 1,2,7,104,7255,2280064,2708080414,13039886441460
%N a(n) is the number of n X n matrices of 0's, 1's and -1's in which the entries in each row or column sum to 1 and there are no adjacent -1's or 1's in any row or column.
%Y Cf. A005130 (Robbins numbers).
%Y Cf. A050204 (entries in each row or column sum to 1).
%K nonn,more
%O 1,2
%A _Eric W. Weisstein_, Sep 25 2013
%E Additional terms from _R. H. Hardin_, Sep 25 2013