A252320 Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7

56052, 25875, 214325, 1741936, 14105723, 115183853, 937981280, 7634090167, 62282796267, 507708324342, 4135550419263, 33696297343761, 274629581667992, 2238121992115863, 18238035152920308, 148617809035822492

Offset

1,1

Comments

Column 7 of A252321

Links

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

Example

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

Crossrefs

Sequence in context: A229436 A022224 A230336 * A252020 A360188 A031655

Adjacent sequences: A252317 A252318 A252319 * A252321 A252322 A252323

Keyword

nonn

Author

R. H. Hardin, Dec 16 2014

Status

approved