A197890 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,3,0,1,1 for x=0,1,2,3,4

1, 7, 50, 1141, 82343, 13332946, 5912587870, 6734852964403

Offset

1,2

Comments

Every 0 is next to 0 3's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 1's

Diagonal of A197896

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A319884 A204463 A041086 * A320989 A015495 A056581

Adjacent sequences: A197887 A197888 A197889 * A197891 A197892 A197893

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved