A187405 Number of (n+1)X(n+1) 0..5 arrays with diagonal zero and the i,j-th 2X2 subblock sum equal to the j,i-th 2X2 subblock sum

36, 4332, 2164680, 4935992256, 54448184779776, 3028538328016591872

Offset

1,1

Comments

Column 5 of A187408

Links

Table of n, a(n) for n=1..6.

Example

Some solutions for 4X4
..0..3..0..3....0..3..3..1....0..3..3..3....0..3..3..3....0..0..0..3
..1..0..2..4....3..0..0..2....2..0..4..1....5..0..4..1....0..0..4..1
..0..4..0..4....2..1..0..1....4..4..0..3....1..4..0..5....2..2..0..0
..4..1..5..0....2..1..1..0....1..2..2..0....3..3..3..0....3..1..2..0

Crossrefs

Sequence in context: A163034 A339121 A184270 * A102794 A075415 A127856

Adjacent sequences: A187402 A187403 A187404 * A187406 A187407 A187408

Keyword

nonn

Author

R. H. Hardin Mar 09 2011

Status

approved