A256727 Number of (n+2)X(n+2) 0..1 arrays with no 3x3 subblock diagonal sum zero and no antidiagonal sum three

384, 21904, 2267136, 635846656, 369798053888, 518482372363264, 1660456237166444544, 12360763736706787835904, 213138208143073867255382016, 8574203840471307169557947613184, 794898094262223266831863119010856960

Offset

1,1

Comments

Diagonal of A256735

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=2
..1..0..0..0....1..0..1..0....1..1..0..1....1..1..0..1....1..1..0..0
..1..1..0..0....1..0..1..0....1..1..1..0....0..0..0..0....1..1..0..0
..0..1..1..1....1..0..1..1....1..0..1..0....1..1..0..1....0..0..0..0
..1..1..1..1....1..0..1..1....1..0..1..1....0..0..1..1....0..1..0..1

Crossrefs

Cf. A256735

Sequence in context: A128967 A168675 A190401 * A023098 A188783 A008692

Adjacent sequences: A256724 A256725 A256726 * A256728 A256729 A256730

Keyword

nonn

Author

R. H. Hardin, Apr 09 2015

Status

approved