A206870 Number of nX7 0..1 arrays avoiding 0 0 0 horizontally and 1 0 1 vertically

81, 6561, 165783, 4108471, 115505069, 3254925997, 90497940567, 2513905109615, 69918135147567, 1945015733467487, 54104019551291657, 1504951979516380911, 41861310528949142861, 1164403984942205341081, 32388853771860099448897

Offset

1,1

Comments

Column 7 of A206871

Links

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

Example

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

Crossrefs

Sequence in context: A206993 A223791 A206935 * A181223 A223977 A188565

Adjacent sequences: A206867 A206868 A206869 * A206871 A206872 A206873

Keyword

nonn

Author

R. H. Hardin Feb 13 2012

Status

approved