A204083 Number of nX7 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1

0, 1296, 321696, 76212900, 35085052464, 11178644528704, 4337212764978412, 1498281295226032144, 567807619899311335040, 205028149066906874768656, 74857377988343607529835840, 27424703888122495940623920100

Offset

1,2

Comments

Column 7 of A204084

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=5
..1..0..0..0..0..0..1....0..0..0..2..2..0..1....2..1..0..2..3..1..0
..1..0..1..1..1..1..1....1..1..1..1..1..0..1....0..1..0..1..0..1..0
..2..0..1..0..0..0..0....2..3..1..0..3..1..0....0..2..2..1..0..0..0
..0..0..3..0..1..0..0....0..0..1..0..0..1..0....1..1..0..1..3..2..1
..1..1..0..0..1..1..1....1..1..1..0..3..1..0....3..0..0..1..0..0..1

Crossrefs

Sequence in context: A017596 A249586 A223360 * A067492 A222338 A013841

Adjacent sequences: A204080 A204081 A204082 * A204084 A204085 A204086

Keyword

nonn

Author

R. H. Hardin Jan 10 2012

Status

approved