A252220 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4

228, 1028, 9566, 58334, 412514, 4329476, 44099648, 415405634, 3886445124, 36834748542, 350195757374, 3322757907650, 31500492289092, 298706072056064, 2833049748399426, 26869277927218244, 254824501845465374

Offset

1,1

Comments

Diagonal of A252228

Links

R. H. Hardin, Table of n, a(n) for n = 1..34

Example

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

Crossrefs

Sequence in context: A258557 A206005 A228963 * A263301 A053174 A335270

Adjacent sequences: A252217 A252218 A252219 * A252221 A252222 A252223

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved