A198665 Number of nX4 0..4 arrays with values 0..4 introduced in row major order and each element equal to one or two horizontal and vertical neighbors

2, 65, 2715, 199923, 16089057, 1382332582, 119026441960, 10314841920242, 893422225702521, 77438142132961570, 6711121950891144754, 581664320030297340439, 50412657929233287557664, 4369297837622133342788917

Offset

1,1

Comments

Column 4 of A198669

Links

R. H. Hardin, Table of n, a(n) for n = 1..74

Example

Some solutions with all values 0 to 4 for n=3
..0..1..2..2....0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..2
..0..1..3..4....2..3..3..3....2..3..3..3....2..2..3..3....0..0..1..2
..3..3..3..4....2..4..4..3....2..4..4..4....4..4..1..1....3..3..4..4

Crossrefs

Sequence in context: A002604 A294273 A199145 * A185029 A228081 A214366

Adjacent sequences: A198662 A198663 A198664 * A198666 A198667 A198668

Keyword

nonn

Author

R. H. Hardin Oct 28 2011

Status

approved