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 A304156 T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. 7
 0, 0, 0, 0, 3, 0, 0, 5, 5, 0, 0, 18, 4, 18, 0, 0, 61, 42, 42, 61, 0, 0, 209, 130, 346, 130, 209, 0, 0, 702, 464, 1767, 1767, 464, 702, 0, 0, 2381, 1722, 10182, 13279, 10182, 1722, 2381, 0, 0, 8069, 6378, 60352, 100942, 100942, 60352, 6378, 8069, 0, 0, 27330, 22939, 350540 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .0....0.....0.......0........0..........0...........0.............0 .0....3.....5......18.......61........209.........702..........2381 .0....5.....4......42......130........464........1722..........6378 .0...18....42.....346.....1767......10182.......60352........350540 .0...61...130....1767....13279.....100942......839935.......6803634 .0..209...464...10182...100942....1100030....12806826.....145611915 .0..702..1722...60352...839935...12806826...217640633....3520683600 .0.2381..6378..350540..6803634..145611915..3520683600...80851458613 .0.8069.22939.2034140.54261600.1634366796.56360283031.1830588080314 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: a(n) = 3*a(n-1) +a(n-2) +2*a(n-3) -2*a(n-4) -4*a(n-5) for n>6 k=3: [order 18] for n>19 k=4: [order 66] for n>67 EXAMPLE Some solutions for n=5 k=4 ..0..1..0..1. .0..1..0..0. .0..1..0..1. .0..1..1..0. .0..1..0..1 ..1..0..1..0. .1..0..1..1. .0..1..1..0. .1..0..0..1. .1..1..0..0 ..1..1..1..1. .1..0..0..0. .1..0..1..0. .1..0..0..1. .0..1..1..1 ..0..1..0..0. .1..0..0..1. .0..1..1..1. .1..0..0..1. .0..1..1..1 ..1..0..1..1. .0..1..0..1. .1..0..1..0. .1..0..0..1. .0..1..0..0 CROSSREFS Column 2 is A303684. Sequence in context: A072736 A135090 A303690 * A305509 A305175 A316763 Adjacent sequences: A304153 A304154 A304155 * A304157 A304158 A304159 KEYWORD nonn,tabl AUTHOR R. H. Hardin, May 07 2018 STATUS approved

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Last modified June 25 18:50 EDT 2024. Contains 373707 sequences. (Running on oeis4.)