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 A230513 T(n,k)=Number of nXk 0..7 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 8, and upper left element zero 5
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 16, 2, 0, 0, 8, 170, 170, 8, 0, 0, 32, 1716, 4648, 1716, 32, 0, 0, 118, 18588, 129874, 129874, 18588, 118, 0, 0, 440, 215314, 4038314, 10308020, 4038314, 215314, 440, 0, 0, 1664, 2510424, 129829460, 918775180, 918775180 (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...0.......0.........2.........8........32.........118........440.....1664 .0...0......16.......170......1716.....18588......215314....2510424.29109876 .0...2.....170......4648....129874...4038314...129829460.4177480490 .0...8....1716....129874..10308020.918775180.84808478358 .0..32...18588...4038314.918775180 .0.118..215314.129829460 .0.440.2510424 LINKS R. H. Hardin, Table of n, a(n) for n = 1..60 FORMULA Empirical for column k: k=2: a(n) = 5*a(n-1) -4*a(n-2) -5*a(n-3) +9*a(n-4) +12*a(n-5) k=3: [order 32] EXAMPLE Some solutions for n=3 k=4 ..0..7..6..5....0..7..0..1....0..7..6..5....0..1..2..1....0..1..0..1 ..1..4..5..4....1..6..5..2....1..2..3..4....7..6..3..2....7..2..3..2 ..2..3..2..1....2..3..4..3....0..7..2..1....4..5..4..1....6..5..4..1 CROSSREFS Sequence in context: A031361 A155955 A221076 * A300138 A217028 A145684 Adjacent sequences: A230510 A230511 A230512 * A230514 A230515 A230516 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Oct 21 2013 STATUS approved

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Last modified February 8 08:49 EST 2023. Contains 360138 sequences. (Running on oeis4.)