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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 (list; table; graph; refs; listen; history; text; internal format)
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

R. H. Hardin, Table of n, a(n) for n = 1..337

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

Adjacent sequences:  A202976 A202977 A202978 * A202980 A202981 A202982

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Dec 26 2011

STATUS

approved

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Last modified July 19 22:14 EDT 2019. Contains 325168 sequences. (Running on oeis4.)