A207900 Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 0 and 1 1 1 vertically

42, 1764, 8928, 47320, 231900, 1153532, 5888458, 29719004, 148308700, 747498440, 3783114924, 19018273952, 95539877180, 481930389188, 2429549328924, 12220600155324, 61525298964898, 310087031694592, 1561597935502608

Offset

1,1

Comments

Row 7 of A207895

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..1..0..0....1..0..0..1....0..0..1..1....1..1..1..1....1..1..0..0
..1..1..1..0....1..1..0..0....0..0..1..1....0..1..0..0....1..1..0..0
..0..0..1..1....0..1..1..1....1..1..0..0....0..0..1..0....0..0..1..1
..0..1..0..0....1..0..0..1....0..1..1..1....1..1..1..1....1..0..0..1
..1..0..0..1....0..0..1..0....0..0..1..0....1..0..0..1....0..1..1..0
..1..1..1..0....1..1..0..0....1..0..0..1....0..0..1..0....0..1..0..0
..0..1..1..1....0..1..1..1....0..1..1..1....0..1..0..0....1..0..0..1

Crossrefs

Sequence in context: A208687 A207351 A207773 * A207660 A207452 A208554

Adjacent sequences: A207897 A207898 A207899 * A207901 A207902 A207903

Keyword

nonn

Author

R. H. Hardin Feb 21 2012

Status

approved