A252159 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7

2581, 1930, 2264, 9058, 90638, 1007913, 13087197, 433466577, 10924924975, 323391798040, 35279164500443, 1921851255032605, 127953336003292258

Offset

1,1

Comments

Diagonal of A252167

Links

Table of n, a(n) for n=1..13.

Example

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

Crossrefs

Sequence in context: A303400 A235094 A171257 * A252167 A252160 A236425

Adjacent sequences: A252156 A252157 A252158 * A252160 A252161 A252162

Keyword

nonn

Author

R. H. Hardin, Dec 14 2014

Status

approved