A252449 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 4 6 or 7

661, 334, 3366, 48170, 1058050, 36760486, 1956458824, 160517960252, 20418505768994, 3997026837680912, 1204054337705584421, 559547936390811196991

Offset

1,1

Comments

Diagonal of A252457

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A342994 A252457 A252450 * A252401 A171394 A243886

Adjacent sequences: A252446 A252447 A252448 * A252450 A252451 A252452

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved