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 A284075 T(n,k)=Number of nXk 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements. 12
 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 6, 15, 0, 0, 0, 33, 275, 314, 0, 0, 0, 176, 3174, 7302, 3764, 0, 0, 0, 858, 31898, 147864, 151310, 37557, 0, 0, 0, 4000, 300008, 2696970, 5555954, 2816826, 353608, 0, 0, 0, 18298, 2695374, 45973823, 189363893, 188451507 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,12 COMMENTS Table starts .0.0......0........0..........0............0..............0................0 .0.0......1........6.........33..........176............858.............4000 .0.0.....15......275.......3174........31898.........300008..........2695374 .0.0....314.....7302.....147864......2696970.......45973823........754541156 .0.0...3764...151310....5555954....189363893.....5950703039.....179626388248 .0.0..37557..2816826..188451507..11888242488...690497721277...38373427448124 .0.0.353608.48994058.6011835223.700044712076.74965549398304.7663959789277668 LINKS R. H. Hardin, Table of n, a(n) for n = 1..161 FORMULA Empirical for column k: k=1: a(n) = a(n-1) k=2: a(n) = a(n-1) k=3: [order 24] k=4: [order 51] Empirical for row n: n=1: a(n) = a(n-1) n=2: [order 12] n=3: [order 42] n=4: [order 84] EXAMPLE Some solutions for n=4 k=4 ..0..1..1..1. .0..1..0..1. .0..1..1..0. .0..0..0..0. .1..1..0..1 ..1..0..1..0. .1..1..1..0. .0..0..0..0. .0..1..1..1. .1..1..1..0 ..0..1..1..1. .0..1..1..0. .0..1..1..1. .1..1..0..1. .1..1..0..0 ..1..0..0..0. .1..0..0..0. .0..1..1..1. .1..0..1..1. .0..1..0..1 CROSSREFS Sequence in context: A364530 A263695 A158965 * A281693 A013314 A328339 Adjacent sequences: A284072 A284073 A284074 * A284076 A284077 A284078 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Mar 19 2017 STATUS approved

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Last modified May 20 19:00 EDT 2024. Contains 372720 sequences. (Running on oeis4.)