A202978 Number of n X 7 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors.

1, 69, 3507, 122468, 4590696, 170937904, 6330398606, 235362503738, 8754859878268, 325475861455984, 12099539397621289, 449821095241853452, 16722911203146960563, 621702975576594657954, 23112884157721171287549

Offset

1,2

Comments

Column 7 of A202979.

Links

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

Example

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

Crossrefs

Cf. A202979.

Sequence in context: A017785 A017732 A252998 * A206859 A207204 A207210

Adjacent sequences: A202975 A202976 A202977 * A202979 A202980 A202981

Keyword

nonn

Author

R. H. Hardin, Dec 26 2011

Status

approved