A251985 Number of (n+2)X(1+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 1 or 5.

2735, 20011, 151635, 1182549, 9375901, 75153161, 607579255, 4944443285, 40443930239, 332131192315, 2735841001847, 22588518781409, 186835789553003, 1547470411052649, 12830167435737421, 106458740090742571

Offset

1,1

Comments

Column 1 of A251989

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=3
..1..0..2....0..2..0....0..2..0....0..0..0....0..2..2....1..0..1....0..0..2
..2..0..1....1..2..0....2..0..0....0..0..0....2..2..2....1..1..0....0..2..0
..1..2..1....2..0..2....0..2..0....2..2..0....0..0..2....0..1..2....0..2..0
..1..0..2....0..0..2....0..2..2....0..0..0....0..2..2....2..0..0....2..2..0
..2..1..1....0..2..0....0..0..0....0..2..0....2..0..2....2..2..0....0..2..0

Crossrefs

Sequence in context: A251946 A045155 A251989 * A297512 A297726 A122473

Adjacent sequences: A251982 A251983 A251984 * A251986 A251987 A251988

Keyword

nonn

Author

R. H. Hardin, Dec 12 2014

Status

approved