A230244 Number of n X n 0..3 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

0, 2, 34, 18218, 38111288, 575915716590, 57955254721687188

Offset

1,2

Comments

Diagonal of A230250

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A002782 A155205 A303444 * A365881 A045529 A293245

Adjacent sequences: A230241 A230242 A230243 * A230245 A230246 A230247

Keyword

nonn

Author

R. H. Hardin, Oct 13 2013

Status

approved