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A220279
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..1 nXk array
5
1, 1, 1, 2, 6, 2, 4, 25, 25, 4, 7, 87, 148, 87, 7, 12, 322, 1142, 1142, 322, 12, 21, 1168, 7987, 14111, 7987, 1168, 21, 37, 4303, 55034, 192553, 192553, 55034, 4303, 37, 65, 15680, 383153, 2539218, 4761666, 2539218, 383153, 15680, 65, 114, 57251, 2657666
OFFSET
1,4
COMMENTS
Table starts
...1.....1.......2........4.........7........12.......21........37.......65
...1.....6......25.......87.......322......1168.....4303.....15680....57251
...2....25.....148.....1142......7987.....55034...383153...2657666.18466741
...4....87....1142....14111....192553...2539218.33491982.441269929
...7...322....7987...192553...4761666.120451866
..12..1168...55034..2539218.120451866
..21..4303..383153.33491982
..37.15680.2657666
..65.57251
.114
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..1..0..1....0..0..0..0....1..0..1..1....0..0..0..1....0..1..0..0
..1..0..0..1....1..1..1..0....0..0..1..1....0..0..1..1....0..0..0..0
..0..0..0..0....0..1..1..0....0..0..0..1....1..0..1..0....1..0..0..1
CROSSREFS
Column 1 is A005251(n+1)
Sequence in context: A220242 A220375 A220430 * A221188 A220532 A373409
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 09 2012
STATUS
approved