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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
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
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Jan 06 2012
STATUS
approved

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Last modified April 13 05:19 EDT 2024. Contains 371639 sequences. (Running on oeis4.)