A198623 Number of nX4 0..5 arrays with values 0..5 introduced in row major order and each element equal to at least one horizontal or vertical neighbor

2, 76, 3904, 342414, 38208073, 5040999127, 713917706692, 104761044616109, 15592916566103795, 2336049130708319067, 350907921051582692624, 52773848213221906515449, 7940710788554386562472855

Offset

1,1

Comments

Column 4 of A198627

Links

R. H. Hardin, Table of n, a(n) for n = 1..52

Example

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

Crossrefs

Sequence in context: A276203 A324216 A198704 * A198651 A198658 A277298

Adjacent sequences: A198620 A198621 A198622 * A198624 A198625 A198626

Keyword

nonn

Author

R. H. Hardin Oct 27 2011

Status

approved