A252193 Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 5 6 or 7

441, 470, 1647, 21928, 480526, 16789626, 896763106, 73759241737, 9393184984437, 1838801806417542, 553960321837762379, 257519518174289401266, 184540608154581393175482, 203698879433082432079178181

Offset

1,1

Comments

Diagonal of A252201

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A187239 A272716 A124170 * A207650 A207045 A252201

Adjacent sequences: A252190 A252191 A252192 * A252194 A252195 A252196

Keyword

nonn

Author

R. H. Hardin, Dec 15 2014

Status

approved