A252024 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 or 4

213, 323, 2206, 29781, 672903, 23454804, 1251157837, 102663081633, 13029064255431, 2550191681514097, 768743005287335321, 357205125608485782595

Offset

1,1

Comments

Diagonal of A252032

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=4
..2..2..1..2..2..2....2..2..2..2..2..1....2..2..2..2..1..0....2..1..2..2..2..2
..2..2..2..1..2..2....2..1..2..2..2..2....1..2..2..2..2..1....2..2..2..2..2..1
..2..1..2..2..1..2....2..2..2..2..2..2....2..2..2..1..2..2....2..2..2..2..2..2
..2..2..2..2..2..1....2..2..2..2..2..2....2..2..2..2..2..2....2..2..2..2..1..2
..2..2..2..2..2..2....1..2..2..1..2..2....2..2..2..2..2..2....2..2..1..2..2..2
..2..1..2..2..1..2....2..1..2..2..2..2....2..2..2..2..2..2....2..2..2..2..2..2

Crossrefs

Sequence in context: A238019 A251146 A085309 * A302256 A092127 A082967

Adjacent sequences: A252021 A252022 A252023 * A252025 A252026 A252027

Keyword

nonn

Author

R. H. Hardin, Dec 12 2014

Status

approved