A186953 1/729 the number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace

0, 3783, 5903759, 47796308777, 1557834542977401, 226578401020498502579

Offset

1,2

Comments

Diagonal of A186962

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X4
..0..0..0..0....1..0..0..0....1..0..0..0....2..0..0..0....1..0..0..0
..2..2..1..1....0..1..1..2....2..0..1..1....1..0..1..0....0..2..2..1
..0..0..0..1....0..1..1..2....2..2..2..2....1..1..0..0....2..2..0..2
..2..0..0..0....2..0..2..1....2..2..0..2....1..1..0..1....2..0..1..2

Crossrefs

Sequence in context: A243777 A135200 A348148 * A107539 A046837 A237733

Adjacent sequences: A186950 A186951 A186952 * A186954 A186955 A186956

Keyword

nonn

Author

R. H. Hardin Mar 01 2011

Status

approved