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 A278855 T(n,k)=Number of nXk 0..1 arrays with rows in nondecreasing lexicographic order and columns in nonincreasing lexicographic order, but with exactly three mistakes. 8
 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 25, 66, 25, 0, 1, 239, 1348, 1348, 239, 1, 8, 1486, 15066, 30772, 15066, 1486, 8, 36, 7072, 118158, 449677, 449677, 118158, 7072, 36, 120, 27828, 731444, 4950399, 9317846, 4950399, 731444, 27828, 120, 330, 94720, 3813048 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,12 COMMENTS Table starts ...0.....0........0..........0............0..............1................8 ...0.....0........1.........25..........239...........1486.............7072 ...0.....1.......66.......1348........15066.........118158...........731444 ...0....25.....1348......30772.......449677........4950399.........44571591 ...0...239....15066.....449677......9317846......154090507.......2167109763 ...1..1486...118158....4950399....154090507.....4026240722......92891826961 ...8..7072...731444...44571591...2167109763....92891826961....3637198028018 ..36.27828..3813048..344302564..26799758534..1935392159582..131770344218055 .120.94720.17413532.2353207764.297417275848.36831668321915.4438698421228261 LINKS R. H. Hardin, Table of n, a(n) for n = 1..219 FORMULA Empirical for column k: k=1: [polynomial of degree 7] k=2: [polynomial of degree 14] k=3: [polynomial of degree 27] k=4: [polynomial of degree 52] k=5: [polynomial of degree 101] EXAMPLE Some solutions for n=4 k=4 ..1..0..1..0. .1..1..1..0. .1..0..0..0. .1..0..0..0. .1..1..1..1 ..0..0..1..0. .0..1..1..0. .1..0..1..0. .1..0..1..0. .0..1..0..0 ..0..0..0..1. .0..0..0..1. .1..0..0..0. .1..0..0..1. .1..1..1..0 ..1..0..1..1. .0..1..0..1. .0..1..0..0. .1..0..0..0. .0..1..1..1 CROSSREFS Column 1 is A000580(n+1). Sequence in context: A033682 A020283 A211462 * A137186 A109676 A223888 Adjacent sequences:  A278852 A278853 A278854 * A278856 A278857 A278858 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Nov 29 2016 STATUS approved

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Last modified June 21 00:26 EDT 2021. Contains 345327 sequences. (Running on oeis4.)