A195961 Number of nX7 0..4 arrays with each element equal to the number its horizontal and vertical neighbors unequal to itself

1, 21, 82, 105, 92, 410, 945, 1919, 4478, 10274, 27467, 73240, 184074, 475431, 1290711, 3500703, 9203789, 24842074, 67959738, 185261546, 500164424, 1364785665, 3747581211, 10238569012, 27972042011, 76776169280, 210809165289

Offset

1,2

Comments

Column 7 of A195962

Links

R. H. Hardin, Table of n, a(n) for n = 1..173

Example

Some solutions for n=5
..2..1..1..1..1..1..1....1..2..2..3..2..2..1....1..3..2..2..3..2..1
..1..1..4..3..3..4..3....1..3..3..4..3..3..1....1..4..3..3..4..2..1
..1..1..1..1..1..1..1....1..1..1..1..1..1..1....1..2..2..2..2..2..1
..3..4..1..1..1..1..1....3..1..1..1..1..1..3....1..2..4..3..3..4..1
..1..1..1..2..2..3..2....1..1..3..2..2..1..1....1..2..3..2..2..3..1

Crossrefs

Sequence in context: A158493 A159743 A219593 * A359024 A190023 A071397

Adjacent sequences: A195958 A195959 A195960 * A195962 A195963 A195964

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved