A252506 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 2 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 2 5 6 or 7

1262, 1644, 11476, 68163, 505129, 5381168, 59046724, 864964151, 15499377193, 419125606602, 36655528860363, 2033535839480653, 152297210256507368, 47940020237135094139, 5579424296594967852346

Offset

1,1

Comments

Diagonal of A252514

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=4
..2..2..2..3..1..3....1..2..2..3..1..2....3..2..2..1..3..2....2..2..2..1..3..2
..2..1..3..1..3..2....3..1..3..1..3..1....1..3..1..3..1..2....1..3..1..3..1..2
..1..3..1..3..1..2....1..3..1..3..1..2....3..1..3..1..3..2....3..1..3..1..3..1
..3..1..3..1..3..2....2..1..3..1..3..2....1..3..1..3..1..3....1..3..1..3..1..2
..2..3..1..3..1..3....2..3..1..3..1..2....2..1..3..1..3..1....3..1..3..1..3..2
..2..2..2..1..3..2....2..1..3..1..3..1....2..2..1..3..1..2....2..2..1..3..2..2

Crossrefs

Sequence in context: A045183 A252514 A252507 * A205762 A331824 A234676

Adjacent sequences: A252503 A252504 A252505 * A252507 A252508 A252509

Keyword

nonn

Author

R. H. Hardin, Dec 18 2014

Status

approved