A203915 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..1 introduced in row major order

112, 1682, 21470, 262088, 3191760, 38438912, 457030140, 5384729088, 62912016986, 730166033682, 8416701868906, 96505946204192, 1100473855059936, 12494678609945088, 141221958080796180, 1590433321339235592

Offset

1,1

Comments

Diagonal of A203923

Links

Table of n, a(n) for n=1..16.

Example

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

Crossrefs

Sequence in context: A327633 A210300 A210293 * A233884 A246895 A188153

Adjacent sequences: A203912 A203913 A203914 * A203916 A203917 A203918

Keyword

nonn

Author

R. H. Hardin Jan 07 2012

Status

approved