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Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element at a city block distance of two, and containing the value n(n+1)/2-6
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%I #4 Dec 18 2015 18:18:10

%S 0,0,34,5395,2083264,208868785,7959909333

%N Number of lower triangular n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any element at a city block distance of two, and containing the value n(n+1)/2-6

%C Column 5 of A212036

%e Some solutions for n=4

%e ..0........0........0........0........0........0........0........0

%e ..1.1......1.2......1.2......1.2......0.1......1.1......1.2......1.2

%e ..2.2.3....3.2.4....3.3.1....1.3.4....2.1.0....2.3.3....3.2.4....3.3.4

%e ..4.4.1.0..5.6.0.1..0.0.4.3..4.5.6.2..2.3.3.4..0.0.4.5..4.5.5.6..4.0.1.2

%K nonn

%O 1,3

%A _R. H. Hardin_ Apr 27 2012