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%I #8 Jul 19 2023 07:19:58
%S 4,12,228,41852,80524892,1720483641156
%N Number of n X n 0..3 arrays with row and column sums one greater than the previous row and column.
%e Some solutions for n=4
%e ..3..1..0..2....1..0..1..2....0..0..0..3....0..2..2..0....2..1..1..2
%e ..0..2..3..2....1..1..2..1....2..1..1..0....3..1..0..1....0..1..3..3
%e ..1..2..2..3....1..1..3..1....0..2..1..2....1..1..1..3....1..2..3..2
%e ..2..2..3..2....1..3..0..3....1..1..3..1....0..1..3..3....3..3..1..2
%Y Column 3 of A202864.
%K nonn,more
%O 1,1
%A _R. H. Hardin_, Dec 25 2011
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