A187402 Number of (n+1)X(n+1) 0..2 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum

9, 141, 4743, 378999, 77470101, 43182942669, 69704886620367, 343603587128867631, 5351921330163734358189, 265547472520415711196418101

Offset

1,1

Comments

Column 2 of A187408

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for 4X4
..0..0..2..1....0..2..0..0....0..2..0..1....0..2..0..2....0..2..0..2
..2..0..2..0....1..0..0..2....2..0..2..0....2..0..1..1....2..0..2..0
..0..2..0..2....0..1..0..1....2..0..0..0....0..1..0..1....0..2..0..1
..2..1..1..0....1..0..2..0....1..0..2..0....2..1..1..0....2..0..1..0

Crossrefs

Sequence in context: A263966 A371365 A083084 * A363478 A303147 A317354

Adjacent sequences: A187399 A187400 A187401 * A187403 A187404 A187405

Keyword

nonn

Author

R. H. Hardin Mar 09 2011

Status

approved