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A279977 T(n,k) is the number of n X k 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 14

%I #8 Sep 20 2023 18:48:55

%S 0,1,0,0,3,0,3,9,9,0,3,24,50,31,0,9,62,221,296,108,0,15,134,822,1922,

%T 1650,366,0,31,277,2669,10491,15511,8666,1205,0,57,542,8068,50690,

%U 124030,118857,43543,3873,0,108,1035,23169,226771,887491,1393359,876704,211650

%N T(n,k) is the number of n X k 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

%H R. H. Hardin, <a href="/A279977/b279977.txt">Table of n, a(n) for n = 1..198</a>

%F Empirical for column k:

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

%F k=2: a(n) = 9*a(n-1) -30*a(n-2) +45*a(n-3) -30*a(n-4) +9*a(n-5) -a(n-6)

%F k=3: [order 9] for n>10

%F k=4: [order 24]

%F k=5: [order 38] for n>39

%F k=6: [order 96] for n>97

%F Empirical for row n:

%F n=1: a(n) = 3*a(n-1) -5*a(n-3) +3*a(n-5) +a(n-6)

%F n=2: [order 8] for n>10

%F n=3: [order 24] for n>30

%F n=4: [order 68] for n>78

%e Table starts:

%e .0.....1.......0.........3...........3............9.............15

%e .0.....3.......9........24..........62..........134............277

%e .0.....9......50.......221.........822.........2669...........8068

%e .0....31.....296......1922.......10491........50690.........226771

%e .0...108....1650.....15511......124030.......887491........5870751

%e .0...366....8666....118857.....1393359.....14787217......144819856

%e .0..1205...43543....876704....15071233....237386464.....3444870482

%e .0..3873..211650...6281773...158391708...3703836674....79672440007

%e .0.12207.1002602..43997218..1627160233..56499013470..1801951754910

%e .0.37859.4652327.302544617.16409869901.846166990079.40020022178950

%e ...

%e Some solutions for n=4 and k=4:

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

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

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

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

%Y Row 1 is A105423(n-2).

%K nonn,tabl

%O 1,5

%A _R. H. Hardin_, Dec 24 2016

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Last modified April 24 12:48 EDT 2024. Contains 371942 sequences. (Running on oeis4.)