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A231764 T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with no element having a strict majority of its horizontal, diagonal and antidiagonal neighbors equal to one 15

%I #4 Nov 13 2013 09:01:13

%S 9,33,16,100,136,36,315,625,660,81,961,2976,5041,3213,169,3024,15625,

%T 38160,40000,14989,361,9409,84817,356409,493695,303601,70927,784,

%U 29319,440896,3453471,8231161,5879679,2353156,338352,1681,91204,2280000

%N T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with no element having a strict majority of its horizontal, diagonal and antidiagonal neighbors equal to one

%C Table starts

%C ....9.......33........100...........315.............961...............3024

%C ...16......136........625..........2976...........15625..............84817

%C ...36......660.......5041.........38160..........356409............3453471

%C ...81.....3213......40000........493695.........8231161..........143424652

%C ..169....14989.....303601.......5879679.......175642009.........5493044921

%C ..361....70927....2353156......71884125......3855664836.......216545491864

%C ..784...338352...18318400.....893571840.....85629975876......8624298007460

%C .1681..1603633..141681409...10965349591...1881009507001....340129511751843

%C .3600..7596720.1096603225..134407778400..41320353904281..13416072442152345

%C .7744.36066272.8501393209.1654812479232.910635938795025.530629269304561623

%H R. H. Hardin, <a href="/A231764/b231764.txt">Table of n, a(n) for n = 1..219</a>

%F Empirical for column k:

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

%F k=2: [order 21]

%F k=3: [order 45]

%F Empirical for row n:

%F n=1: a(n) = 3*a(n-1) +a(n-3) +7*a(n-4) -20*a(n-5) -2*a(n-6) -4*a(n-8) +8*a(n-9)

%F n=2: [order 36]

%e Some solutions for n=3 k=4

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

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

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

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

%Y Column 1 is A207170 for n>1

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_, Nov 13 2013

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)