A252261 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 4 6 or 7

103, 272, 3016, 44612, 984416, 34351677, 1834743688, 150852965253, 19211276199162, 3761840357784248, 1133324153448761962, 526775964680392301856, 377486194195325500755089

Offset

1,1

Comments

Diagonal of A252269

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Sequence in context: A200732 A033204 A046297 * A141992 A023327 A023324

Adjacent sequences: A252258 A252259 A252260 * A252262 A252263 A252264

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved