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%I #9 Jun 06 2018 15:19:28
%S 1,15,7445,70985206,8615950028840,13585407518869992739
%N Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order.
%e Some solutions for n=5
%e ..0..1..0..0..1....0..0..1..0..0....0..0..1..0..0....0..0..1..1..0
%e ..0..0..1..2..1....2..1..3..2..2....2..0..3..0..2....0..1..0..0..2
%e ..3..1..3..0..0....2..2..3..2..2....0..3..1..1..2....1..1..0..0..3
%e ..1..0..2..0..1....3..1..1..3..1....0..2..0..1..0....1..3..1..1..0
%e ..0..2..0..1..1....1..2..1..3..2....3..2..2..3..2....2..3..2..3..1
%Y Diagonal of A205310.
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 25 2012
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