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%I #7 Sep 04 2022 22:08:42
%S 144,27216,28005264,157025515248,4802315365587600,
%T 801390350388172407408,729769248139791415275682704,
%U 3626511808446899710619902249927536
%N Number of (n+1) X (n+1) 0..3 arrays with no 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.
%C Diagonal of A203826.
%e Some solutions for n=4
%e ..3..2..3..0..0....0..2..2..1..0....3..1..1..1..3....1..2..0..1..0
%e ..3..0..3..2..1....3..1..0..1..0....3..0..2..0..3....0..2..3..1..2
%e ..1..2..3..0..0....0..1..2..1..3....3..0..1..1..1....1..2..0..0..2
%e ..1..0..3..1..3....3..1..2..0..2....3..2..3..0..2....0..3..3..3..2
%e ..1..0..2..0..0....2..1..2..0..1....1..1..1..0..2....0..1..1..0..2
%Y Cf. A203826.
%K nonn
%O 1,1
%A _R. H. Hardin_, Jan 06 2012
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