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A220375 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nXk array 4
1, 1, 1, 2, 6, 2, 4, 23, 23, 4, 7, 94, 236, 94, 7, 12, 380, 2095, 2095, 380, 12, 21, 1494, 18296, 39780, 18296, 1494, 21, 37, 5939, 154562, 722126, 722126, 154562, 5939, 37, 65, 23398, 1280878, 12480964, 26483660, 12480964, 1280878, 23398, 65, 114, 92317 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,4
COMMENTS
Table starts
..1.....1.......2........4........7.......12........21.......37....65.114
..1.....6......23.......94......380.....1494......5939....23398.92317
..2....23.....236.....2095....18296...154562...1280878.10492879
..4....94....2095....39780...722126.12480964.209958887
..7...380...18296...722126.26483660
.12..1494..154562.12480964
.21..5939.1280878
.37.23398
.65
LINKS
EXAMPLE
Some solutions for n=3 k=4
..1..0..1..1....0..0..0..0....0..0..0..0....1..1..0..1....0..0..0..0
..1..1..0..1....0..1..0..0....1..1..1..1....1..1..0..1....0..1..0..1
..0..0..1..0....0..0..0..1....1..1..1..1....0..1..1..1....0..0..1..1
CROSSREFS
Column 1 is A005251(n+1)
Sequence in context: A021385 A085193 A220242 * A220430 A220279 A221188
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 13 2012
STATUS
approved

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Last modified March 3 00:46 EST 2024. Contains 370499 sequences. (Running on oeis4.)