A183707 Number of (n+1)X7 0..3 arrays with every 2X2 subblock nonsingular.

67718760, 401390133264, 2365244332190880, 13954952466340976784, 82311212150455188873408, 485531851352905710505726272, 2863979225676951763894821578784, 16893652701074804322774461983910592

Offset

1,1

Comments

Column 6 of A183710

Links

Ron Hardin, Table of n, a(n) for n = 1..51

Example

Some solutions for 3X7
..0..2..0..2..0..3..1....0..2..0..2..1..3..2....0..2..0..2..2..3..0
..2..0..2..0..2..1..2....2..0..2..0..3..2..2....2..0..2..0..2..2..1
..0..1..0..2..2..0..1....0..1..0..1..2..1..3....0..1..0..2..0..1..0

Crossrefs

Sequence in context: A161774 A203670 A353203 * A256274 A158890 A230746

Adjacent sequences: A183704 A183705 A183706 * A183708 A183709 A183710

Keyword

nonn

Author

R. H. Hardin, Jan 06 2011

Status

approved