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URL: https://oeis.org/A198604

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A198604
T(n,k)=Number of 2nX2k 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.
8
1, 1, 1, 2, 5, 2, 5, 32, 32, 5, 14, 251, 674, 251, 14, 41, 1985, 14396, 14396, 1985, 41, 122, 15761, 309770, 844228, 309770, 15761, 122, 365, 125168, 6671450, 49726877, 49726877, 6671450, 125168, 365, 1094, 994127, 143724590, 2934981667, 8055413256
OFFSET
1,4
COMMENTS
Table starts
....1.......1..........2............5............14............41
....1.......5.........32..........251..........1985.........15761
....2......32........674........14396........309770.......6671450
....5.....251......14396.......844228......49726877....2934981667
...14....1985.....309770.....49726877....8055413256.1308245895665
...41...15761....6671450...2934981667.1308245895665
..122..125168..143724590.173328303620
..365..994127.3096625676
.1094.7895777
.3281
LINKS
EXAMPLE
All solutions for n=2 k=2
..0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1....0..0..0..0
..0..0..1..1....0..0..1..1....0..0..1..1....0..0..1..1....0..1..1..0
..2..2..3..3....1..1..0..0....2..2..0..0....1..1..2..2....0..1..1..0
..2..2..3..3....1..1..0..0....2..2..0..0....1..1..2..2....0..0..0..0
CROSSREFS
Column 1 is A007051(n-2)
Sequence in context: A240706 A240642 A240774 * A198253 A159989 A195702
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Oct 27 2011
STATUS
approved