A252425 Number of (n+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 4 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 4 6 or 7.

641, 688, 1810, 7575, 85563, 1190037, 10924203, 384953455, 14875741975, 235391624751, 26396547463733, 2950331202467754, 75986516939085808, 27838867253853706000, 9086935218480182872031

Offset

1,1

Comments

Diagonal of A252433.

Links

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

Example

Some solutions for n=4
..3..0..1..3..0..1....3..2..2..3..2..2....3..0..1..3..3..1....3..2..2..0..2..2
..3..2..2..3..2..2....2..3..2..2..0..2....0..2..2..3..2..2....2..3..2..2..3..2
..2..3..2..2..3..2....3..3..1..3..3..1....2..3..2..2..0..2....3..3..1..3..3..1
..0..3..1..3..3..1....3..2..2..3..2..2....3..3..1..3..3..1....0..2..2..3..2..2
..3..2..2..0..2..2....2..3..2..2..0..2....3..2..2..3..2..2....2..3..2..2..3..2
..2..0..2..2..3..2....0..3..1..3..3..1....2..3..2..2..3..2....3..0..1..3..0..1

Crossrefs

Cf. A252433.

Sequence in context: A268875 A252426 A256777 * A160203 A251840 A252433

Adjacent sequences: A252422 A252423 A252424 * A252426 A252427 A252428

Keyword

nonn

Author

R. H. Hardin, Dec 17 2014

Status

approved