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A233140 Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.

%I A233140 #7 Jul 23 2025 07:54:39
%S A233140 1,16,13259,198313130,39758352524643,104628720219120084935,
%T A233140 3612824935976380302597462081,1636876887880533270191858718052988313
%N A233140 Number of n X n 0..5 arrays with no element x(i,j) adjacent to value 5-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order.
%C A233140 Diagonal of A233147
%e A233140 Some solutions for n=3
%e A233140 ..0..0..1....0..1..2....0..1..2....0..0..1....0..1..2....0..1..5....0..1..5
%e A233140 ..4..0..1....3..0..4....2..0..1....4..2..0....1..5..4....1..5..2....2..2..4
%e A233140 ..2..1..1....0..4..0....1..0..0....0..4..4....5..5..3....5..1..5....5..4..5
%K A233140 nonn
%O A233140 1,2
%A A233140 _R. H. Hardin_, Dec 04 2013