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A231746 T(n,k)=Number of nXk 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors 6

%I #4 Nov 13 2013 05:40:40

%S 4,4,4,16,84,16,50,318,318,50,144,1328,4430,1328,144,422,6064,60806,

%T 60806,6064,422,1268,26918,784076,2154900,784076,26918,1268,3823,

%U 116909,9945132,71742015,71742015,9945132,116909,3823,11472,511264,126926437

%N T(n,k)=Number of nXk 0..3 arrays with no element less than a strict majority of its horizontal and vertical neighbors

%C Table starts

%C ....4......4.........16............50..............144..................422

%C ....4.....84........318..........1328.............6064................26918

%C ...16....318.......4430.........60806...........784076..............9945132

%C ...50...1328......60806.......2154900.........71742015...........2426463539

%C ..144...6064.....784076......71742015.......6425495277.........598711367728

%C ..422..26918....9945132....2426463539.....598711367728......155985773478611

%C .1268.116909..126926437...82701946547...56006640316980....40539474933206048

%C .3823.511264.1625269595.2814528154294.5220406326242670.10471241201508754882

%H R. H. Hardin, <a href="/A231746/b231746.txt">Table of n, a(n) for n = 1..111</a>

%F Empirical for column k:

%F k=1: a(n) = 4*a(n-1) -6*a(n-2) +10*a(n-3) -5*a(n-4) +6*a(n-5) -a(n-6) +a(n-7) for n>8

%F k=2: [order 19] for n>20

%F k=3: [order 87] for n>88

%e Some solutions for n=3 k=4

%e ..0..2..0..0....3..1..1..2....0..2..1..0....0..0..2..2....1..1..3..1

%e ..0..3..0..3....3..1..0..0....0..0..0..0....1..0..0..3....3..1..1..1

%e ..0..1..0..0....3..1..0..0....0..3..3..1....3..1..0..0....0..0..0..0

%Y Column 1 is A203094 for n>1

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Nov 13 2013

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Last modified April 25 09:49 EDT 2024. Contains 371967 sequences. (Running on oeis4.)