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 A236789 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median plus the lower median minus the minimum of every 2X2 subblock equal 9
 81, 255, 255, 770, 1097, 770, 2475, 4452, 4452, 2475, 7967, 19851, 23675, 19851, 7967, 26320, 87889, 145124, 145124, 87889, 26320, 87685, 405350, 867928, 1287919, 867928, 405350, 87685, 296341, 1877803, 5547565, 10951425, 10951425, 5547565 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ......81.......255........770.........2475...........7967............26320 .....255......1097.......4452........19851..........87889...........405350 .....770......4452......23675.......145124.........867928..........5547565 ....2475.....19851.....145124......1287919.......10951425........101820364 ....7967.....87889.....867928.....10951425......128004881.......1684255298 ...26320....405350....5547565....101820364.....1684255298......32223974061 ...87685...1877803...35115362....921870137....20959676762.....570994921148 ..296341...8891685..230220290...8733287503...278468706789...11000072878624 .1009386..42339874.1500418737..81211467440..3553360015495..200824005818655 .3469327.204256129.9979134414.774898990883.47248656876065.3868923775555236 LINKS R. H. Hardin, Table of n, a(n) for n = 1..180 FORMULA Empirical for column k: k=1: [linear recurrence of order 18] k=2: [order 35] k=3: [order 83] EXAMPLE Some solutions for n=3 k=4 ..1..2..0..2..1....0..0..0..0..0....0..2..1..1..2....0..0..0..0..1 ..0..1..1..1..2....2..1..1..1..1....1..1..0..1..2....0..0..0..0..0 ..2..1..0..1..2....0..0..0..0..0....2..2..1..2..1....0..1..0..0..0 ..0..1..1..1..2....2..1..2..1..1....2..2..1..0..1....0..0..0..2..0 CROSSREFS Sequence in context: A225027 A225020 A219131 * A236798 A237067 A236782 Adjacent sequences:  A236786 A236787 A236788 * A236790 A236791 A236792 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Jan 31 2014 STATUS approved

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Last modified November 29 14:23 EST 2020. Contains 338769 sequences. (Running on oeis4.)