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A203460 T(n,k)=Number of nXk 0..2 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 8
1, 1, 1, 1, 3, 1, 1, 9, 9, 1, 1, 22, 84, 22, 1, 1, 63, 543, 543, 63, 1, 1, 209, 3748, 8837, 3748, 209, 1, 1, 686, 29677, 143936, 143936, 29677, 686, 1, 1, 2228, 237999, 2527020, 5660631, 2527020, 237999, 2228, 1, 1, 7365, 1882149, 44974778, 231588325 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

.1....1.......1.........1............1...............1.................1

.1....3.......9........22...........63.............209...............686

.1....9......84.......543.........3748...........29677............237999

.1...22.....543......8837.......143936.........2527020..........44974778

.1...63....3748....143936......5660631.......231588325........9441977403

.1..209...29677...2527020....231588325.....22078482448.....2078403848722

.1..686..237999..44974778...9441977403...2078403848722...449985495293440

.1.2228.1882149.799146435.385259518988.195550611728699.97229907706009899

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..144

EXAMPLE

Some solutions for n=5 k=3

..0..1..1....1..2..2....0..2..2....2..2..1....0..2..2....1..2..2....0..2..2

..0..1..1....2..2..2....2..2..2....2..2..1....0..2..2....1..2..2....2..2..2

..1..1..1....2..1..1....2..1..0....0..2..1....1..1..0....2..2..1....2..1..1

..1..2..2....2..2..0....2..2..1....2..2..2....2..2..2....2..2..2....2..2..1

..1..2..2....2..2..0....2..2..1....2..2..2....2..2..2....1..2..2....2..2..0

CROSSREFS

Sequence in context: A319729 A106340 A156610 * A157179 A152655 A144493

Adjacent sequences:  A203457 A203458 A203459 * A203461 A203462 A203463

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified September 26 03:46 EDT 2021. Contains 347664 sequences. (Running on oeis4.)