A200800 Number of nX7 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors

715, 9676364, 122478253815, 1557479347400065, 19804473216531794553, 251826890612151285556718, 3202145671418507455058837791

Offset

1,1

Comments

Column 7 of A200801

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A208871 A208878 A208174 * A208200 A208407 A208414

Adjacent sequences: A200797 A200798 A200799 * A200801 A200802 A200803

Keyword

nonn

Author

R. H. Hardin Nov 22 2011

Status

approved