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A221188
T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..2 nXk array
3
1, 1, 1, 2, 6, 2, 4, 27, 27, 4, 7, 107, 274, 107, 7, 12, 461, 2648, 2648, 461, 12, 21, 1844, 23765, 51924, 23765, 1844, 21, 37, 7502, 203122, 928133, 928133, 203122, 7502, 37, 65, 29893, 1686374, 15638551, 32233374, 15638551, 1686374, 29893, 65, 114, 119342
OFFSET
1,4
COMMENTS
Table starts
..1.....1.......2........4........7.......12........21.......37.....65.114
..1.....6......27......107......461.....1844......7502....29893.119342
..2....27.....274.....2648....23765...203122...1686374.13787513
..4...107....2648....51924...928133.15638551.256020803
..7...461...23765...928133.32233374
.12..1844..203122.15638551
.21..7502.1686374
.37.29893
.65
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..0..0..0....1..0..1..0....1..0..0..0....0..0..0..0....1..1..1..1
..0..0..1..1....0..1..0..1....0..0..1..1....0..0..0..1....0..0..0..0
..1..1..1..0....0..1..1..0....1..0..0..1....0..0..1..0....1..1..1..1
CROSSREFS
Column 1 is A005251(n+1)
Column 2 is A220529
Sequence in context: A220375 A220430 A220279 * A220532 A373409 A060295
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Jan 04 2013
STATUS
approved