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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 (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......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

R. H. Hardin, Table of n, a(n) for n = 1..49

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 A060295 A102912

Adjacent sequences:  A221185 A221186 A221187 * A221189 A221190 A221191

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Jan 04 2013

STATUS

approved

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Last modified January 26 01:48 EST 2020. Contains 331270 sequences. (Running on oeis4.)