A196905 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,1,2,0,4 for x=0,1,2,3,4

1, 6, 50, 1193, 72523, 12186565, 5388703976, 6460441732687, 21001711750441755

Offset

1,2

Comments

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

Diagonal of A196912

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A363315 A058784 A008380 * A066303 A301436 A136383

Adjacent sequences: A196902 A196903 A196904 * A196906 A196907 A196908

Keyword

nonn

Author

R. H. Hardin Oct 07 2011

Status

approved