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A202979
T(n,k)=Number of nXk 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors
8
1, 1, 1, 1, 2, 1, 1, 4, 4, 1, 1, 7, 17, 7, 1, 1, 14, 58, 58, 14, 1, 1, 31, 215, 385, 215, 31, 1, 1, 69, 866, 2582, 2582, 866, 69, 1, 1, 155, 3507, 17740, 31380, 17740, 3507, 155, 1, 1, 354, 14120, 122468, 379788, 379788, 122468, 14120, 354, 1, 1, 814, 56921, 846908
OFFSET
1,5
COMMENTS
Table starts
.1...1.....1......1........1..........1............1..............1
.1...2.....4......7.......14.........31...........69............155
.1...4....17.....58......215........866.........3507..........14120
.1...7....58....385.....2582......17740.......122468.........846908
.1..14...215...2582....31380.....379788......4590696.......55723864
.1..31...866..17740...379788....8071997....170937904.....3635245483
.1..69..3507.122468..4590696..170937904...6330398606...235362503738
.1.155.14120.846908.55723864.3635245483.235362503738.15305115754880
LINKS
EXAMPLE
Some solutions for n=5 k=3
..1..1..1....0..1..1....1..1..0....0..0..0....1..1..1....0..1..1....0..0..0
..1..1..1....1..1..1....1..1..0....0..1..1....1..1..1....0..1..1....1..1..1
..1..1..0....1..1..1....1..0..0....1..1..1....0..0..0....1..1..0....1..1..1
..1..1..1....0..0..0....1..1..1....1..1..1....1..1..0....1..1..1....1..1..0
..0..1..1....0..0..0....0..1..1....1..1..1....1..1..0....0..1..1....0..0..0
CROSSREFS
Sequence in context: A156184 A056588 A126770 * A306326 A156006 A137854
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 26 2011
STATUS
approved