A199519 Number of nX4 0..3 arrays with values 0..3 introduced in row major order, the number of instances of each value within one of each other, and every element equal to two or fewer horizontal or vertical neighbors

1, 105, 15400, 2491383, 425836476, 76066541392, 14045226977086, 2659503142845964, 513629992322483274, 100788315834577397826, 20037985877897676968942

Offset

1,2

Comments

Column 4 of A199523

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A269474 A255497 A094075 * A082368 A001546 A111647

Adjacent sequences: A199516 A199517 A199518 * A199520 A199521 A199522

Keyword

nonn

Author

R. H. Hardin Nov 07 2011

Status

approved