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A203346 T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 8
1, 1, 1, 1, 5, 1, 1, 25, 25, 1, 1, 95, 635, 95, 1, 1, 425, 9555, 9555, 425, 1, 1, 2329, 142167, 503409, 142167, 2329, 1, 1, 12487, 2566719, 23912553, 23912553, 2566719, 12487, 1, 1, 64444, 48091042, 1288066857, 3742207236, 1288066857, 48091042, 64444, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

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

.1.....5........25............95...............425...............2329

.1....25.......635..........9555............142167............2566719

.1....95......9555........503409..........23912553.........1288066857

.1...425....142167......23912553........3742207236.......643689050030

.1..2329...2566719....1288066857......643689050030....360171255368417

.1.12487..48091042...72606563663...112737045408576.202012748290560363

.1.64444.870803077.4048732987777.19611990609779478

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..84

EXAMPLE

Some solutions for n=5 k=3

..2..3..3....0..0..0....4..4..0....2..2..0....4..4..3....3..3..2....2..4..4

..2..4..4....2..2..0....4..4..2....2..4..4....4..4..3....3..3..2....3..4..4

..1..4..4....4..4..0....0..3..2....1..4..4....4..2..1....4..4..3....3..3..2

..0..4..4....4..4..2....4..4..4....0..1..1....4..4..4....4..4..4....2..2..0

..0..2..2....2..2..2....4..4..4....0..0..0....0..4..4....1..4..4....0..0..0

CROSSREFS

Sequence in context: A156600 A329118 A152572 * A176793 A118190 A172342

Adjacent sequences:  A203343 A203344 A203345 * A203347 A203348 A203349

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Dec 31 2011

STATUS

approved

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Last modified November 12 05:52 EST 2019. Contains 329051 sequences. (Running on oeis4.)