%I #6 Dec 18 2015 18:17:47
%S 1,1,16,145,8781,770738,209244430,130044352635,201766678562403,
%T 769785349802611323,7207100576124898000123,166275868999956401361788826
%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,2,3,0,4 for x=0,1,2,3,4
%C Every 0 is next to 0 1's, every 1 is next to 1 2's, every 2 is next to 2 3's, every 3 is next to 3 0's, every 4 is next to 4 4's
%C Diagonal of A196578
%e Some solutions for n=4
%e ..0..0..3..0....0..0..3..0....0..3..0..0....0..0..3..0....0..0..3..0
%e ..3..0..0..0....0..0..0..3....0..0..0..0....3..0..0..3....3..0..0..3
%e ..0..0..0..0....0..0..0..0....0..0..0..3....0..0..0..0....0..0..0..0
%e ..0..0..0..0....0..0..3..0....0..0..0..0....0..0..3..0....0..0..0..0
%K nonn
%O 1,3
%A _R. H. Hardin_ Oct 04 2011