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A197431 T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,1,1 for x=0,1,2,3,4 7
1, 3, 3, 4, 9, 4, 5, 20, 20, 5, 9, 71, 68, 71, 9, 16, 227, 448, 448, 227, 16, 25, 664, 2152, 5197, 2152, 664, 25, 39, 2107, 10684, 43909, 43909, 10684, 2107, 39, 64, 6675, 55567, 410456, 720447, 410456, 55567, 6675, 64, 105, 20696, 280544, 4017895, 11769456 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Every 0 is next to 0 4's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 1's, every 4 is next to 4 1's
Table starts
...1.....3.......4..........5............9..............16................25
...3.....9......20.........71..........227.............664..............2107
...4....20......68........448.........2152...........10684.............55567
...5....71.....448.......5197........43909..........410456...........4017895
...9...227....2152......43909.......720447........11769456.........195632425
..16...664...10684.....410456.....11769456.......337295264........9869104795
..25..2107...55567....4017895....195632425......9869104795......529968166606
..39..6675..280544...37566429...3187783369....292706228390....27927270266251
..64.20696.1425111..351740354..53026008675...8642552356445..1461399711177586
.105.65029.7280350.3301443327.881220874951.253114165333694.76357681634837889
LINKS
EXAMPLE
Some solutions containing all values 0 to 4 for n=6 k=4
..1..2..1..0....1..1..0..1....0..0..0..1....1..0..0..1....0..1..1..0
..0..2..1..0....0..2..0..1....0..2..1..3....3..1..1..1....2..1..4..1
..0..1..3..0....0..1..3..1....0..1..4..1....1..4..1..0....1..0..1..1
..1..4..1..1....1..4..1..0....0..3..1..0....0..1..4..1....2..1..3..0
..1..1..0..1....1..1..3..0....2..1..2..0....2..1..1..2....0..1..1..2
..0..2..1..2....0..0..1..1....1..0..0..0....1..0..0..0....1..2..0..1
CROSSREFS
Column 1 is A195971
Column 2 is A197403
Sequence in context: A196218 A196685 A197409 * A197672 A348884 A284115
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Oct 14 2011
STATUS
approved

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Last modified May 27 18:18 EDT 2024. Contains 372880 sequences. (Running on oeis4.)