A196449 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,2,4,1 for x=0,1,2,3,4

1, 6, 40, 594, 27320, 3707781, 926499600, 539621963877, 739769209147928

Offset

1,2

Comments

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

Diagonal of A196456

Links

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

Example

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

Crossrefs

Sequence in context: A053677 A204563 A356540 * A281262 A186196 A196478

Adjacent sequences: A196446 A196447 A196448 * A196450 A196451 A196452

Keyword

nonn

Author

R. H. Hardin Oct 02 2011

Status

approved