A231240 Number of n X n 0..3 arrays x(i,j) with each element horizontally, diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero

0, 2, 78, 5992, 1872136, 2532190370, 13176773912306, 263345856214302416, 20480387479891154414778

Offset

1,2

Comments

Diagonal of A231246

Links

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

Example

Some solutions for n=4
..0..3..0..3....0..1..2..1....0..3..0..3....0..1..2..1....0..3..2..3
..2..1..2..1....0..1..2..3....0..1..0..3....2..1..2..3....0..1..0..3
..2..3..2..1....2..1..0..3....2..3..0..1....0..3..0..3....0..1..0..3
..0..1..0..3....0..3..2..1....2..1..2..3....2..1..0..3....0..1..2..3

Crossrefs

Sequence in context: A184965 A157062 A008273 * A197101 A245674 A342979

Adjacent sequences: A231237 A231238 A231239 * A231241 A231242 A231243

Keyword

nonn

Author

R. H. Hardin, Nov 06 2013

Status

approved