A186527 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock determinant equal to any horizontal or vertical neighbor 2X2 subblock determinant

81, 8410, 4456218, 11180777496, 132204817900858

Offset

1,1

Comments

Diagonal of A186536

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3X3
..1..1..1....1..2..2....1..0..1....2..1..0....2..1..0....2..2..0....1..0..2
..1..2..1....1..1..0....2..1..0....2..0..2....2..0..2....0..2..0....1..1..0
..2..0..2....0..1..2....1..2..2....1..2..0....2..2..0....1..0..2....2..2..2

Crossrefs

Sequence in context: A123847 A115443 A328089 * A178511 A184337 A034993

Adjacent sequences: A186524 A186525 A186526 * A186528 A186529 A186530

Keyword

nonn

Author

R. H. Hardin Feb 23 2011

Status

approved