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A231396 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order 15

%I #4 Nov 08 2013 17:20:52

%S 3,7,4,14,8,7,33,38,15,12,78,90,100,20,23,189,363,311,272,31,44,482,

%T 1163,1706,1096,740,52,87,1225,3985,7844,8340,4085,2061,95,172,3238,

%U 14650,35696,55788,41237,15732,5834,180,343,8565,50088,184692,345022,401240

%N T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with values 0..2 introduced in row major order

%C Table starts

%C ...3...7.....14......33........78........189........482.......1225.......3238

%C ...4...8.....38......90.......363.......1163.......3985......14650......50088

%C ...7..15....100.....311......1706.......7844......35696.....184692.....873979

%C ..12..20....272....1096......8340......55788.....345022....2502891...16525492

%C ..23..31....740....4085.....41237.....401240....3407422...34218952..319475231

%C ..44..52...2061...15732....217846....3002376...35510853..491895476.6459555901

%C ..87..95...5834...62039...1158551...22654165..374180527.7170248270

%C .172.180..16521..245850...6261166..172363558.3979476204

%C .343.351..46969..980361..34110556.1318257485

%C .684.692.133864.3915982.186830745

%H R. H. Hardin, <a href="/A231396/b231396.txt">Table of n, a(n) for n = 1..111</a>

%F Empirical for column k:

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

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

%F k=3: [order 18]

%F k=4: [order 28] for n>31

%F Empirical for row n:

%F n=1: a(n) = 4*a(n-1) +a(n-2) -16*a(n-3) +4*a(n-4) +24*a(n-5) -16*a(n-6)

%F n=2: [order 21]

%F n=3: [order 83]

%e Some solutions for n=4 k=4

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

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

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

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

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

%Y Column 1 is A023105(n+2)

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Nov 08 2013

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Last modified May 23 15:34 EDT 2024. Contains 372763 sequences. (Running on oeis4.)