A252067 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 or 4

92, 152, 1497, 21862, 480464, 16789564, 896763044, 73759241675, 9393184984375, 1838801806417480, 553960321837762317, 257519518174289401204, 184540608154581393175420, 203698879433082432079178119

Offset

1,1

Comments

Diagonal of A252075

Links

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

Example

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

Crossrefs

Sequence in context: A046116 A273286 A257761 * A182266 A116215 A272369

Adjacent sequences: A252064 A252065 A252066 * A252068 A252069 A252070

Keyword

nonn

Author

R. H. Hardin, Dec 13 2014

Status

approved