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 A183719 T(n,k) = 1/20 of the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease. 9
 2, 5, 5, 12, 17, 12, 29, 54, 54, 29, 70, 174, 224, 174, 70, 169, 559, 950, 950, 559, 169, 408, 1797, 4012, 5362, 4012, 1797, 408, 985, 5776, 16964, 30113, 30113, 16964, 5776, 985, 2378, 18566, 71712, 169560, 224640, 169560, 71712, 18566, 2378, 5741, 59677 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ....2......5......12........29.........70..........169...........408 ....5.....17......54.......174........559.........1797..........5776 ...12.....54.....224.......950.......4012........16964.........71712 ...29....174.....950......5362......30113.......169560........954496 ...70....559....4012.....30113.....224640......1683197......12606120 ..169...1797...16964....169560....1683197.....16823812.....168070828 ..408...5776...71712....954496...12606120....168070828....2239265280 ..985..18566..303170...5374440...94463507...1680902120...29887741084 .2378..59677.1281664..30261345..707826798..16810325640..398877017736 .5741.191821.5418314.170394226.5304230928.168150768145.5325395568832 LINKS R. H. Hardin, Table of n, a(n) for n = 1..363 EXAMPLE Some solutions for 4 X 3: ..3..0..4....3..0..4....1..4..1....0..1..4....3..4..3....1..2..1....2..1..2 ..2..1..2....2..1..2....2..3..2....4..2..3....2..0..1....4..3..0....3..0..4 ..3..0..4....3..4..3....0..4..0....0..1..0....3..4..3....1..2..1....2..1..2 ..2..1..3....2..1..2....2..3..1....3..2..3....2..1..2....0..3..4....3..0..3 ... ...R..L.......R..L.......L..R.......R..L.......R..L.......R..L.......L..R... ...L..R.......L..R.......R..L.......L..R.......L..R.......L..R.......R..L... ...R..L.......R..L.......L..R.......R..L.......R..L.......R..L.......L..R... CROSSREFS Sequence in context: A274108 A368616 A138316 * A239340 A124201 A100953 Adjacent sequences: A183716 A183717 A183718 * A183720 A183721 A183722 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Jan 06 2011 STATUS approved

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Last modified June 22 08:18 EDT 2024. Contains 373567 sequences. (Running on oeis4.)