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 A183289 T(n,k) = Half the number of n X k binary arrays with the number of 1-1 horizontal, vertical, diagonal and antidiagonal adjacencies equal to the number of 0-0 adjacencies. 6
 1, 1, 1, 1, 3, 1, 2, 6, 6, 2, 3, 18, 1, 18, 3, 6, 60, 180, 180, 60, 6, 10, 210, 116, 2184, 116, 210, 10, 20, 756, 8016, 28440, 28440, 8016, 756, 20, 35, 2772, 9746, 385316, 150979, 385316, 9746, 2772, 35, 70, 10296, 398126, 5358022, 20021342, 20021342, 5358022 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts ..1.....1........1...........2..............3.................6 ..1.....3........6..........18.............60...............210 ..1.....6........1.........180............116..............8016 ..2....18......180........2184..........28440............385316 ..3....60......116.......28440.........150979..........20021342 ..6...210.....8016......385316.......20021342........1085177164 .10...756.....9746.....5358022......174883800.......60444425412 .20..2772...398126....75912216....15784256016.....3432989914472 .35.10296...725872..1090973732...190371233229...197894482415760 .70.38610.20910204.15858156696.13214123612340.11543252431044600 LINKS R. H. Hardin, Table of n, a(n) for n = 1..2000 EXAMPLE All solutions for 3 X 3 with a(1,1)=0 ..0..1..0 ..1..0..1 ..0..1..0 CROSSREFS Column 1 is A001405(n-2). Column 2 is 3*A000984(n-2). Sequence in context: A317863 A318214 A318552 * A183253 A201675 A279859 Adjacent sequences: A183286 A183287 A183288 * A183290 A183291 A183292 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jan 03 2011 STATUS approved

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Last modified September 16 09:24 EDT 2024. Contains 375965 sequences. (Running on oeis4.)