A185984 1/128 the number of (n+2) X (n+2) binary arrays with each 3 X 3 subblock trace equal to some horizontal or vertical neighbor 3 X 3 subblock trace.

0, 76, 8948, 2854756, 2340935640, 5140797159777, 29671205957160911, 453752833171594711936, 18348281443087840943497571

Offset

1,2

Comments

Diagonal of A185993.

Links

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

Example

Some solutions for 4 X 4:
..0..1..0..0....1..0..1..1....0..1..1..0....0..0..1..1....1..1..0..0
..0..1..1..0....0..1..1..1....1..0..0..0....0..0..0..1....0..1..1..0
..1..1..1..0....0..1..0..1....0..0..1..1....0..1..1..1....1..1..0..0
..1..0..1..0....0..1..0..0....0..1..0..1....0..1..0..0....0..1..0..0

Crossrefs

Cf. A185993.

Sequence in context: A093276 A184290 A093238 * A289227 A028480 A229413

Adjacent sequences: A185981 A185982 A185983 * A185985 A185986 A185987

Keyword

nonn,more

Author

R. H. Hardin, Feb 08 2011

Status

approved