A204300 Number of nX7 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order

0, 776, 164112, 38262132, 17549848472, 5589659640640, 2168622256129656, 749141388620048272, 283903844662926128576, 102514076157660926553040

Offset

1,2

Comments

Column 7 of A204301

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A177845 A177843 A202893 * A043519 A043384 A237162

Adjacent sequences: A204297 A204298 A204299 * A204301 A204302 A204303

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved