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 A230398 T(n,k)=Number of nXk 0..4 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 5, and upper left element zero 6
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 82, 82, 2, 0, 0, 8, 842, 3200, 842, 8, 0, 0, 32, 9068, 88580, 88580, 9068, 32, 0, 0, 120, 92538, 2467778, 6605632, 2467778, 92538, 120, 0, 0, 430, 934880, 68210356, 501998702, 501998702, 68210356, 934880, 430, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,17 COMMENTS Table starts .0...0......0..........0.............0..............0..............0 .0...0......0..........0.............2..............8.............32 .0...0......0.........82...........842...........9068..........92538 .0...0.....82.......3200.........88580........2467778.......68210356 .0...2....842......88580.......6605632......501998702....36506815072 .0...8...9068....2467778.....501998702....99394999376.18905431728130 .0..32..92538...68210356...36506815072.18905431728130 .0.120.934880.1854786186.2615818813066 LINKS R. H. Hardin, Table of n, a(n) for n = 1..83 FORMULA Empirical for column k: k=1: a(n) = a(n-1) k=2: a(n) = 4*a(n-1) -4*a(n-3) -9*a(n-4) -6*a(n-5) k=3: [order 31] EXAMPLE Some solutions for n=3 k=4 ..0..4..3..2....0..1..2..3....0..4..3..2....0..4..4..0....0..1..0..3 ..1..2..0..1....4..0..3..4....1..2..3..1....1..2..3..1....4..2..3..4 ..2..3..4..0....3..2..1..0....0..1..4..0....0..4..3..2....3..2..1..0 CROSSREFS Sequence in context: A209585 A090603 A020955 * A120826 A259308 A202965 Adjacent sequences:  A230395 A230396 A230397 * A230399 A230400 A230401 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Oct 18 2013 STATUS approved

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Last modified April 8 05:55 EDT 2020. Contains 333312 sequences. (Running on oeis4.)