A206893 Number of 7Xn 0..1 arrays avoiding 0 1 0 horizontally and 1 0 0 vertically

54, 2916, 82807, 2070564, 57268342, 1648854501, 47015346159, 1328156697136, 37521598580023, 1061970530807292, 30067564211434697, 851046751948225835, 24085315991411166967, 681659412649184727059, 19292878589062169424679

Offset

1,1

Comments

Row 7 of A206889

Links

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

Example

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

Crossrefs

Sequence in context: A188521 A189262 A189700 * A188761 A207093 A188990

Adjacent sequences: A206890 A206891 A206892 * A206894 A206895 A206896

Keyword

nonn

Author

R. H. Hardin Feb 13 2012

Status

approved