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 A220242 T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nXk array 5
 1, 1, 1, 2, 6, 2, 4, 23, 23, 4, 7, 78, 148, 78, 7, 12, 292, 1131, 1131, 292, 12, 21, 1066, 8127, 14976, 8127, 1066, 21, 37, 3922, 58091, 219617, 219617, 58091, 3922, 37, 65, 14420, 419164, 3101079, 5804389, 3101079, 419164, 14420, 65, 114, 53082, 3016838 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Table starts ...1.....1.......2........4.........7........12.......21........37.......65 ...1.....6......23.......78.......292......1066.....3922.....14420....53082 ...2....23.....148.....1131......8127.....58091...419164...3016838.21697096 ...4....78....1131....14976....219617...3101079.43677639.613533257 ...7...292....8127...219617...5804389.165087351 ..12..1066...58091..3101079.165087351 ..21..3922..419164.43677639 ..37.14420.3016838 ..65.53082 .114 LINKS R. H. Hardin, Table of n, a(n) for n = 1..59 EXAMPLE Some solutions for n=3 k=4 ..0..0..0..0....0..0..1..0....1..1..1..0....0..1..1..0....0..1..0..1 ..1..0..1..1....0..1..0..0....1..0..1..1....1..0..0..1....0..1..0..0 ..1..1..0..0....1..0..1..0....0..1..0..0....1..0..0..0....0..0..0..0 CROSSREFS Column 1 is A005251(n+1) Sequence in context: A057606 A021385 A085193 * A220375 A220430 A220279 Adjacent sequences: A220239 A220240 A220241 * A220243 A220244 A220245 KEYWORD nonn,tabl AUTHOR R. H. Hardin Dec 08 2012 STATUS approved

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Last modified December 6 18:14 EST 2023. Contains 367614 sequences. (Running on oeis4.)