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 A209553 T(n,k)=1/4 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences 9
 7, 20, 20, 61, 105, 61, 191, 562, 562, 191, 603, 3051, 5075, 3051, 603, 1909, 16582, 46515, 46515, 16582, 1909, 6049, 90186, 425803, 723636, 425803, 90186, 6049, 19173, 490547, 3901194, 11226644, 11226644, 3901194, 490547, 19173, 60777, 2668340 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .....7......20........61.........191...........603............1909 ....20.....105.......562........3051.........16582...........90186 ....61.....562......5075.......46515........425803.........3901194 ...191....3051.....46515......723636......11226644.......174401424 ...603...16582....425803....11226644.....294738262......7751834609 ..1909...90186...3901194...174401424....7751834609....345350598642 ..6049..490547..35741496..2708892873..203828058161..15380031974285 .19173.2668340.327471411.42079740150.5360172454106.685056630399243 LINKS R. H. Hardin, Table of n, a(n) for n = 1..364 EXAMPLE Some solutions for n=4 k=3 ..0..2..0..2....0..3..2..3....3..2..3..0....1..0..3..0....0..1..2..1 ..2..0..2..0....1..2..3..2....2..3..2..1....2..3..0..3....3..2..1..0 ..0..2..0..2....2..1..2..1....1..0..1..2....1..2..1..2....0..1..2..1 ..2..0..2..0....3..0..1..0....0..1..2..1....2..1..0..3....3..2..3..0 ..0..2..0..2....2..1..2..1....3..2..3..2....1..2..3..0....0..1..2..1 CROSSREFS Sequence in context: A301808 A128817 A284897 * A037005 A022419 A070413 Adjacent sequences:  A209550 A209551 A209552 * A209554 A209555 A209556 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 10 2012 STATUS approved

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Last modified December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)