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A265178 T(n,k)=Number of nXk 0..n*k-1 arrays with upper left zero and lower right n*k-1 and each element differing from its horizontal and vertical neighbors by a power of two. 6
1, 1, 1, 1, 4, 1, 2, 21, 21, 2, 16, 139, 2024, 139, 16, 79, 8463, 170970, 170970, 8463, 79, 456, 219995, 7796840, 36765048, 7796840, 219995, 456, 2194, 6639203, 1346956387, 19256175024, 19256175024, 1346956387, 6639203, 2194, 20801, 149441692 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,5
COMMENTS
Table starts
......1..........1..............1................2................16
......1..........4.............21..............139..............8463
......1.........21...........2024...........170970...........7796840
......2........139.........170970.........36765048.......19256175024
.....16.......8463........7796840......19256175024....62221755947285
.....79.....219995.....1346956387....7187180809683.29140746691543180
....456....6639203...226158945148.2362949716450873
...2194..149441692.16064538255326
..20801.6260685646
.142675
LINKS
EXAMPLE
Some solutions for n=3 k=4
..0..2..6..8....0..8.10.11....0..8..0..2....0..8..9.11....0..2..0..2
..8..0..2.10....4..6..8.10....4..6..2.10....2..6..8.10....4..6..2.10
..6..8.10.11....0..8.10.11....8..4..3.11....6..7..9.11....6..5..3.11
CROSSREFS
Sequence in context: A299067 A299728 A299839 * A159766 A280284 A004161
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 03 2015
STATUS
approved

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Last modified June 18 07:11 EDT 2024. Contains 373469 sequences. (Running on oeis4.)