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A201700 T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards 7

%I #5 Mar 31 2012 12:36:45

%S 3,3,3,3,10,3,3,18,18,3,3,27,116,27,3,3,37,395,395,37,3,3,48,989,4998,

%T 989,48,3,3,60,2068,35390,35390,2068,60,3,3,73,3838,167625,930564,

%U 167625,3838,73,3,3,87,6541,607919,14268351,14268351,607919,6541,87,3,3,102

%N T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards

%C Table starts

%C .3...3.....3........3...........3..............3...............3

%C .3..10....18.......27..........37.............48..............60

%C .3..18...116......395.........989...........2068............3838

%C .3..27...395.....4998.......35390.........167625..........607919

%C .3..37...989....35390......930564.......14268351.......142436489

%C .3..48..2068...167625....14268351......795339012.....27102769900

%C .3..60..3838...607919...142436489....27102769900...3262897246338

%C .3..73..6541..1826778..1034563890...615440785548.253484699853930

%C .3..87.10455..4775228..5898023820.10106227864338

%C .3.102.15894.11211034.27803725006

%H R. H. Hardin, <a href="/A201700/b201700.txt">Table of n, a(n) for n = 1..112</a>

%e Some solutions for n=5 k=3

%e ..0..0..2....0..0..2....0..2..2....0..1..2....0..1..2....0..2..2....0..1..2

%e ..0..2..1....0..0..2....0..2..2....1..0..2....1..0..1....0..2..2....0..2..0

%e ..2..0..1....0..1..0....2..1..2....1..0..2....1..0..1....1..0..2....0..2..0

%e ..2..0..1....1..0..0....2..1..2....1..0..2....1..0..1....1..1..0....1..1..0

%e ..2..2..0....1..0..0....2..2..1....2..2..1....1..1..0....2..0..0....2..0..0

%Y Column 2 is A051938(n+5)

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Dec 03 2011

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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)