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A220794
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..2 nXk array
6
1, 1, 1, 2, 6, 1, 4, 19, 23, 1, 7, 76, 142, 94, 1, 12, 267, 1753, 1224, 380, 1, 21, 1074, 15486, 32507, 9500, 1494, 1, 37, 4069, 132977, 602536, 563715, 74581, 5939, 1, 65, 15916, 1115041, 10731537, 20635919, 9507244, 568257, 23398, 1, 114, 62161
OFFSET
1,4
COMMENTS
Table starts
.1.....1......2.......4........7.......12........21......37....65.114
.1.....6.....19......76......267.....1074......4069...15916.62161
.1....23....142....1753....15486...132977...1115041.9161834
.1....94...1224...32507...602536.10731537.183846017
.1...380...9500..563715.20635919
.1..1494..74581.9507244
.1..5939.568257
.1.23398
.1
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..0..0..0....1..1..0..1....0..0..1..0....0..0..0..0....0..0..1..1
..0..1..1..0....1..1..0..0....0..1..0..1....1..1..1..0....0..1..1..1
..0..0..1..0....0..1..1..1....1..0..1..1....1..1..0..1....1..1..0..0
CROSSREFS
Column 2 is A220372
Row 1 is A005251(n+1)
Sequence in context: A077761 A220406 A372261 * A220959 A360598 A243434
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 21 2012
STATUS
approved