login
A274889
Number of n X n 0..2 arrays with no element equal to any value at offset (0,-1), (-1,-1) or (-2,0) and new values introduced in order 0..2.
0
1, 4, 16, 104, 913, 12217, 237807, 6843349, 292253909, 18485204565, 1735778832010, 242007116498916, 50034244634072936, 15365321608796091811
OFFSET
1,2
COMMENTS
Diagonal of A274895.
EXAMPLE
Some solutions for n=4
..0..1..0..1. .0..1..2..0. .0..1..2..0. .0..1..2..0. .0..1..2..1
..1..2..0..1. .0..1..2..0. .1..2..0..1. .0..1..2..0. .0..2..0..1
..1..0..1..2. .1..2..0..1. .2..0..1..2. .1..2..0..1. .1..2..1..2
..2..0..1..2. .1..2..1..2. .2..0..1..0. .2..0..1..2. .2..0..1..2
CROSSREFS
Cf. A274895.
Sequence in context: A203716 A330537 A136793 * A009630 A318695 A131043
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 10 2016
STATUS
approved