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 A222871 T(n,k)=Number of nXk 0..5 arrays with no element equal to another at a city block distance of exactly two, and new values 0..5 introduced in row major order 5
 1, 2, 2, 3, 7, 3, 7, 34, 34, 7, 20, 370, 816, 370, 20, 67, 5314, 30528, 30528, 5314, 67, 254, 82690, 1186704, 2903520, 1186704, 82690, 254, 1057, 1313794, 46269792, 276768768, 276768768, 46269792, 1313794, 1057, 4700, 20983810, 1804486896, 26393020608 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Table starts .....1.........2...........3.............7.............20.............67 .....2.........7..........34...........370...........5314..........82690 .....3........34.........816.........30528........1186704.......46269792 .....7.......370.......30528.......2903520......276768768....26393020608 ....20......5314.....1186704.....276768768....64508270616.15035444690880 ....67.....82690....46269792...26393020608.15035444690880 ...254...1313794..1804486896.2516653274112 ..1057..20983810.70374883968 ..4700.335593474 .21847 LINKS R. H. Hardin, Table of n, a(n) for n = 1..59 FORMULA Empirical for column k: k=1: a(n) = 11*a(n-1) -41*a(n-2) +61*a(n-3) -30*a(n-4) for n>6 k=2: a(n) = 21*a(n-1) -84*a(n-2) +64*a(n-3) for n>5 k=3: a(n) = 42*a(n-1) -117*a(n-2) for n>4 EXAMPLE Some solutions for n=3 k=4 ..0..1..2..0....0..1..2..3....0..1..2..3....0..1..2..3....0..1..1..2 ..0..3..4..0....0..1..4..4....4..1..5..4....4..5..0..4....3..3..0..4 ..4..2..5..3....2..3..0..1....3..3..5..1....2..2..3..4....2..4..5..1 CROSSREFS Sequence in context: A183407 A222838 A222944 * A222779 A222894 A210753 Adjacent sequences: A222868 A222869 A222870 * A222872 A222873 A222874 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 07 2013 STATUS approved

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Last modified November 28 17:03 EST 2023. Contains 367419 sequences. (Running on oeis4.)