A240887 Number of n X n 0..2 arrays with no element equal to a different number of vertical neighbors than horizontal neighbors, with new values 0..2 introduced in row major order

1, 4, 57, 2362, 245268, 64074526, 41971040844, 69012323813116, 284711573170326892

Offset

1,2

Comments

Diagonal of A240893

Links

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

Example

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

Crossrefs

Sequence in context: A358687 A209317 A231491 * A209316 A221866 A270881

Adjacent sequences: A240884 A240885 A240886 * A240888 A240889 A240890

Keyword

nonn

Author

R. H. Hardin, Apr 14 2014

Status

approved