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A198532 T(n,k)=Number of 2nX2k 0..2 arrays with values 0..2 introduced in row major order and each element equal to exactly one horizontal or vertical neighbor 4
2, 12, 12, 76, 206, 76, 492, 3838, 3838, 492, 3212, 74582, 213328, 74582, 3212, 21036, 1481214, 12510524, 12510524, 1481214, 21036, 137932, 29737425, 757941274, 2223874372, 757941274, 29737425, 137932, 904812, 600187403, 46796529288 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
......2........12..........76..........492.........3212..........21036
.....12.......206........3838........74582......1481214.......29737425
.....76......3838......213328.....12510524....757941274....46796529288
....492.....74582....12510524...2223874372.411119156729.77956630302044
...3212...1481214...757941274.411119156729
..21036..29737425.46796529288
.137932.600187403
.904812
LINKS
EXAMPLE
Some solutions for n=5 k=3
..0..0..1..1..0..0....0..0..1..1..0..0....0..0..1..1..0..0....0..0..1..1..0..0
..1..1..0..0..1..1....1..1..0..0..1..1....1..1..0..0..1..1....1..1..0..0..1..1
..0..0..1..1..0..0....0..0..1..1..0..0....0..0..1..1..0..0....0..0..1..1..0..0
..1..1..0..0..2..1....1..1..0..0..1..1....1..1..0..0..1..1....1..1..0..0..2..2
..0..0..1..1..2..1....0..0..1..1..2..2....0..0..1..1..0..2....0..0..1..1..0..0
..1..1..0..0..1..2....1..1..2..0..1..1....1..1..2..2..0..2....2..1..0..0..2..2
..0..0..2..2..1..2....0..0..2..0..2..0....0..2..0..1..2..1....2..1..2..1..0..1
..1..1..0..1..2..1....2..2..1..1..2..0....0..2..0..1..2..1....0..0..2..1..0..1
..2..2..0..1..2..1....1..0..2..2..1..1....2..0..1..2..0..2....1..2..1..0..2..2
..0..0..2..2..0..0....1..0..1..1..2..2....2..0..1..2..0..2....1..2..1..0..1..1
CROSSREFS
Column 1 is A198474
Sequence in context: A251421 A226393 A371375 * A198477 A075178 A145618
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Oct 26 2011
STATUS
approved

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Last modified July 14 02:38 EDT 2024. Contains 374291 sequences. (Running on oeis4.)