A206335 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor

192, 181, 1340, 1581, 12021, 14181, 108141, 127581, 973221, 1148181, 8758941, 10333581, 78830421, 93002181, 709473741, 837019581, 6385263621, 7533176181, 57467372541, 67798585581, 517206352821, 610187270181, 4654857175341

Offset

1,1

Comments

Diagonal of A206343

Links

R. H. Hardin, Table of n, a(n) for n = 1..34

Example

Some solutions for n=4
..1..0..2..0..2....0..1..0..1..0....1..2..0..2..0....3..3..0..1..0
..0..1..0..2..0....1..0..1..0..1....2..0..2..0..2....1..0..3..0..1
..1..0..1..0..2....0..1..0..1..0....0..2..0..2..0....0..1..0..3..0
..0..1..0..1..0....3..0..1..0..1....1..0..2..0..2....1..0..1..0..3
..1..0..1..0..1....0..3..0..1..3....0..1..0..2..0....0..1..0..1..3

Crossrefs

Sequence in context: A187698 A206343 A206336 * A289219 A190892 A039667

Adjacent sequences: A206332 A206333 A206334 * A206336 A206337 A206338

Keyword

nonn

Author

R. H. Hardin Feb 06 2012

Status

approved