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A220406
T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 nXk array
8
1, 1, 1, 2, 6, 1, 4, 17, 23, 1, 7, 40, 122, 78, 1, 12, 93, 908, 720, 292, 1, 21, 206, 6013, 10989, 4304, 1066, 1, 37, 431, 41510, 128448, 139233, 25391, 3922, 1, 65, 924, 273253, 1701214, 2996186, 1782679, 150079, 14420, 1, 114, 1863, 1851686, 20736643
OFFSET
1,4
COMMENTS
Table starts
.1.....1......2........4........7.......12.......21........37.......65..114.200
.1.....6.....17.......40.......93......206......431.......924.....1863.3898
.1....23....122......908.....6013....41510...273253...1851686.12276677
.1....78....720....10989...128448..1701214.20736643.263993960
.1...292...4304...139233..2996186.76047436
.1..1066..25391..1782679.74035199
.1..3922.150079.22578152
.1.14420.884793
.1.53082
.1
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..0..1..0....1..0..1..1....1..0..0..0....0..0..1..1....1..0..1..1
..1..0..1..0....0..1..0..0....1..0..0..0....0..0..0..1....0..0..0..0
..0..1..1..0....0..0..1..0....0..0..0..1....1..0..1..0....0..0..1..1
CROSSREFS
Column 2 is A220238
Row 1 is A005251(n+1)
Sequence in context: A129677 A324033 A077761 * A372261 A220794 A220959
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 13 2012
STATUS
approved