A252542 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 3 4 6 or 7

478, 3880, 88146, 1179792, 187695936, 38252054800, 1236950585856, 2685007395112960, 4812096201845654016, 332041393326772518912, 10588726246214462018420736, 161406104028388370373509447680

Offset

1,1

Comments

Diagonal of A252544

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for n=3
..3..1..0..3..1....1..0..3..1..0....0..3..1..3..0....3..0..1..3..0
..3..3..1..0..3....0..1..0..3..1....3..2..2..0..2....1..3..3..1..0
..2..1..1..2..1....1..1..2..1..1....2..0..2..2..3....1..2..1..1..2
..3..1..0..0..1....1..3..0..1..3....0..0..1..0..0....0..0..1..0..3
..3..0..1..3..3....3..1..0..3..1....0..2..2..3..2....1..0..0..1..3

Crossrefs

Sequence in context: A252545 A260204 A119129 * A122268 A186950 A056987

Adjacent sequences: A252539 A252540 A252541 * A252543 A252544 A252545

Keyword

nonn

Author

R. H. Hardin, Dec 18 2014

Status

approved