A186065 Number of (n+2)X4 0..2 arrays with each 3X3 subblock having a positive determinant

85950, 2594364, 73704654, 1983108841, 56342354623, 1583479136326, 43674791825894, 1227206096949087, 34442516744766780, 955566424195215926, 26758623787941625854, 750296625321555194450, 20875762248134838402638

Offset

1,1

Comments

Column 2 of A186068

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 6X4
..0..1..0..0....0..1..0..0....0..1..0..0....0..1..0..0....0..1..0..0
..0..0..1..0....0..0..1..0....0..0..1..0....0..0..1..0....0..0..1..0
..2..0..0..1....1..0..0..1....2..0..0..1....1..0..0..2....2..0..0..1
..0..1..0..0....1..1..0..1....1..2..1..1....0..1..2..0....1..1..2..0
..1..1..1..2....2..1..1..0....1..2..2..2....0..0..1..1....1..0..2..1
..1..2..0..2....2..1..0..2....2..2..1..2....2..1..2..1....1..1..0..0

Crossrefs

Sequence in context: A253531 A179575 A234805 * A238309 A203388 A206657

Adjacent sequences: A186062 A186063 A186064 * A186066 A186067 A186068

Keyword

nonn

Author

R. H. Hardin Feb 11 2011

Status

approved