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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
1, 69, 3507, 122468, 4590696, 170937904, 6330398606, 235362503738, 8754859878268, 325475861455984, 12099539397621289, 449821095241853452, 16722911203146960563, 621702975576594657954, 23112884157721171287549
OFFSET
1,2
COMMENTS
Column 7 of A202979.
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 26 2011
STATUS
approved