A196281 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,3,1,4 for x=0,1,2,3,4

1, 5, 7, 335, 3621, 193137, 13307143, 3369153109, 1022753961763, 921078606743691

Offset

1,2

Comments

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

Diagonal of A196287

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A229033 A187022 A196309 * A196331 A344361 A159019

Adjacent sequences: A196278 A196279 A196280 * A196282 A196283 A196284

Keyword

nonn

Author

R. H. Hardin Sep 30 2011

Status

approved