A203342 Number of nX4 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 95, 9555, 503409, 23912553, 1288066857, 72606563663, 4048732987777, 224803736954347, 12536125586656167, 701080855015785026, 39228019277755257087, 2195365093327710655400, 122904723679862273403598

Offset

1,2

Comments

Column 4 of A203346

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..1..4..4..0....4..4..0..0....4..4..1..0....4..4..1..0....2..4..4..2
..3..4..4..1....4..4..3..2....4..4..2..1....4..4..3..0....2..4..4..2
..3..3..1..1....2..3..4..4....1..4..2..1....4..2..3..0....0..3..0..0
..0..0..2..2....3..4..4..4....2..4..4..4....4..4..4..0....1..4..4..4
..0..0..2..2....3..4..4..3....2..3..4..4....1..4..4..0....1..4..4..4

Crossrefs

Sequence in context: A060484 A017811 A017758 * A255936 A203187 A103281

Adjacent sequences: A203339 A203340 A203341 * A203343 A203344 A203345

Keyword

nonn

Author

R. H. Hardin Dec 31 2011

Status

approved