A252287 Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 or 4

1130, 1920, 3848, 8636, 20213, 49671, 126017, 325493, 863661, 2328733, 6346689, 17495936, 48539226, 135312021, 378838196, 1063219826, 2989937045, 8421698434, 23744136508, 67000696936, 189183692883, 534413085829, 1510228773106

Offset

1,1

Comments

Column 2 of A252293

Links

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

Example

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

Crossrefs

Sequence in context: A261404 A023307 A163560 * A211684 A162023 A166957

Adjacent sequences: A252284 A252285 A252286 * A252288 A252289 A252290

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved