A251897 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5

1652, 1548, 1536, 4208, 30504, 120984, 325504, 4618864, 31618896, 127303080, 3373936496, 34737558232, 215577492448, 10277366678144, 169711805448888, 1620323527704184, 134840227340115584, 3566261394625218008

Offset

1,1

Comments

Diagonal of A251905

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Sequence in context: A252684 A203864 A154075 * A251905 A251898 A250929

Adjacent sequences: A251894 A251895 A251896 * A251898 A251899 A251900

Keyword

nonn

Author

R. H. Hardin, Dec 10 2014

Status

approved