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A208840 T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 0 vertically 10

%I #5 Mar 31 2012 12:37:25

%S 2,4,4,6,16,6,10,36,36,9,16,100,78,81,14,26,256,282,171,196,22,42,676,

%T 768,855,406,484,35,68,1764,2430,2421,3010,990,1225,56,110,4624,7086,

%U 9801,8736,11242,2485,3136,90,178,12100,21588,31419,49126,33088,44275

%N T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 1 and 1 1 0 vertically

%C Table starts

%C ..2....4....6.....10.....16.......26.......42........68........110.........178

%C ..4...16...36....100....256......676.....1764......4624......12100.......31684

%C ..6...36...78....282....768.....2430.....7086.....21588......64230......193554

%C ..9...81..171....855...2421.....9801....31419....116919.....394965.....1419849

%C .14..196..406...3010...8736....49126...169974....833364....3166030....14462714

%C .22..484..990..11242..33088...272206...992574...6800596...28280758...173714530

%C .35.1225.2485..44275.131355..1644265..6206445..62470275..277136755..2417186345

%C .56.3136.6328.179032.533568.10399480.40122936.613538688.2842543480.36689660504

%H R. H. Hardin, <a href="/A208840/b208840.txt">Table of n, a(n) for n = 1..1465</a>

%F Empirical for row n:

%F n=1: a(k)=a(k-1)+a(k-2)

%F n=2: a(k)=2*a(k-1)+2*a(k-2)-a(k-3)

%F n=3: a(k)=2*a(k-1)+4*a(k-2)-3*a(k-3)

%F n=4: a(k)=2*a(k-1)+7*a(k-2)-6*a(k-3)

%F n=5: a(k)=2*a(k-1)+12*a(k-2)-11*a(k-3)

%F n=6: a(k)=2*a(k-1)+20*a(k-2)-19*a(k-3)

%F n=7: a(k)=2*a(k-1)+33*a(k-2)-32*a(k-3)

%e Some solutions for n=4 k=3

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

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

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

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

%Y Column 1 is A001611(n+2)

%Y Column 2 is A207436

%Y Column 3 is A208103

%Y Row 1 is A006355(n+2)

%Y Row 2 is A206981

%Y Row 3 is A208689

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Mar 01 2012

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Last modified April 25 06:41 EDT 2024. Contains 371964 sequences. (Running on oeis4.)