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 A283386 T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements. 7
 0, 0, 0, 0, 1, 0, 0, 3, 3, 0, 0, 19, 60, 19, 0, 0, 91, 532, 532, 91, 0, 0, 399, 4420, 8087, 4420, 399, 0, 0, 1734, 34531, 116624, 116624, 34531, 1734, 0, 0, 7257, 257416, 1592250, 2993934, 1592250, 257416, 7257, 0, 0, 29754, 1862717, 20788531, 71707838 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,8 COMMENTS Table starts .0.....0........0..........0............0...............0.................0 .0.....1........3.........19...........91.............399..............1734 .0.....3.......60........532.........4420...........34531............257416 .0....19......532.......8087.......116624.........1592250..........20788531 .0....91.....4420.....116624......2993934........71707838........1644385909 .0...399....34531....1592250.....71707838......3007934404......120672330232 .0..1734...257416...20788531...1644385909....120672330232.....8473366210380 .0..7257..1862717..264040297..36631580212...4702791428260...577497122717510 .0.29754.13180270.3282238215.797807876394.179057922328623.38429377558548084 LINKS R. H. Hardin, Table of n, a(n) for n = 1..180 FORMULA Empirical for column k: k=1: a(n) = a(n-1) k=2: [order 24] k=3: [order 32] k=4: [order 57] for n>58 EXAMPLE Some solutions for n=4 k=4 ..1..1..1..0. .1..0..1..1. .0..0..1..0. .1..1..1..0. .0..0..0..1 ..0..0..1..0. .1..0..1..1. .1..1..0..0. .1..0..0..1. .1..0..1..0 ..0..0..1..0. .0..0..0..0. .1..0..1..0. .0..0..1..1. .1..0..1..1 ..0..1..1..1. .0..1..0..1. .1..1..0..0. .1..0..0..1. .0..1..1..0 CROSSREFS Sequence in context: A309651 A305541 A280810 * A278385 A245626 A307233 Adjacent sequences:  A283383 A283384 A283385 * A283387 A283388 A283389 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Mar 06 2017 STATUS approved

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Last modified November 30 16:23 EST 2021. Contains 349423 sequences. (Running on oeis4.)