Number of 4Xn arrays of permutations containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
Number of 4Xn arrays of permutations containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
Number of 4Xn arrays of permutations of containing n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
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R. H. Hardin, <a href="/A266906/b266906.txt">Table of n, a(n) for n = 1..24</a>
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Number of 4Xn arrays of permutations of n copies of 0..4-1 with no element 1 greater than its north, west or southwest neighbor modulo 4 and the upper left element equal to 0.
2, 13, 102, 1233, 17773, 295717, 5288444, 100047497, 1969179263, 39719367272, 815220460187, 16949934465627, 355839090710684, 7527987550107025, 160278461733848589, 3431017721283599498, 73794099509198635645
1,1
Row 4 of A266904.
Some solutions for n=5
..0..2..1..0..3....0..0..2..2..1....0..2..1..3..1....0..0..3..1..3
..3..2..1..0..3....0..2..0..2..1....3..1..0..2..0....2..0..3..1..3
..3..1..0..3..2....3..1..3..1..3....3..1..3..2..0....0..0..2..1..1
..1..1..0..2..2....3..3..1..0..2....1..3..2..0..2....2..2..2..1..3
Cf. A266904.
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R. H. Hardin, Jan 05 2016
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