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A203846 T(n,k)=Number of nXk 0..3 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors 8
1, 1, 1, 1, 4, 1, 1, 16, 16, 1, 1, 50, 262, 50, 1, 1, 184, 2706, 2706, 184, 1, 1, 810, 28744, 84346, 28744, 810, 1, 1, 3502, 362648, 2507842, 2507842, 362648, 3502, 1, 1, 14751, 4683983, 83049596, 215340781, 83049596, 4683983, 14751, 1, 1, 63204, 58985474 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Table starts

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

.1.....4.......16..........50.............184................810

.1....16......262........2706...........28744.............362648

.1....50.....2706.......84346.........2507842...........83049596

.1...184....28744.....2507842.......215340781........19914461784

.1...810...362648....83049596.....19914461784......5191761888989

.1..3502..4683983..2828543595...1851737877261...1343321735549790

.1.14751.58985474.95696351404.171641650035869.345412651608406381

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..112

EXAMPLE

Some solutions for n=4 k=3

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

..1..2..2....2..2..1....3..3..1....3..3..3....3..3..2....2..2..1....1..2..2

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

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

CROSSREFS

Sequence in context: A010320 A152571 A008304 * A118185 A176483 A174639

Adjacent sequences:  A203843 A203844 A203845 * A203847 A203848 A203849

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified April 7 13:36 EDT 2020. Contains 333305 sequences. (Running on oeis4.)