A196975 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,1,0,4 for x=0,1,2,3,4

1, 5, 65, 2425, 272332, 91153533, 90401915964, 266535433627635, 2320436756494474533

Offset

1,2

Comments

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

Diagonal of A196982

Links

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

Example

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

Crossrefs

Sequence in context: A214348 A195196 A012635 * A247540 A171800 A195244

Adjacent sequences: A196972 A196973 A196974 * A196976 A196977 A196978

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved