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A280069 T(n,k)=Number of nXk 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. 7

%I #4 Dec 25 2016 06:41:52

%S 1,1,1,1,1,1,2,2,2,2,3,4,5,4,3,5,9,15,15,9,5,8,19,39,52,39,19,8,13,41,

%T 104,170,170,104,41,13,21,88,281,603,790,603,281,88,21,34,189,771,

%U 2157,3729,3729,2157,771,189,34,55,406,2122,7777,17468,23564,17468,7777,2122

%N T(n,k)=Number of nXk 0..1 arrays with no element unequal to a strict majority of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards.

%C Table starts

%C ..1...1....1......2.......3........5.........8..........13...........21

%C ..1...1....2......4.......9.......19........41..........88..........189

%C ..1...2....5.....15......39......104.......281.........771.........2122

%C ..2...4...15.....52.....170......603......2157........7777........28195

%C ..3...9...39....170.....790.....3729.....17468.......82769.......394904

%C ..5..19..104....603....3729....23564....145485......915505......5786757

%C ..8..41..281...2157...17468...145485...1188839.....9934415.....83159859

%C .13..88..771...7777...82769...915505...9934415...110266512...1225662273

%C .21.189.2122..28195..394904..5786757..83159859..1225662273..18113056960

%C .34.406.5858.102429.1890877.36671797.698377561.13669391105.268403179093

%H R. H. Hardin, <a href="/A280069/b280069.txt">Table of n, a(n) for n = 1..263</a>

%F Empirical for column k:

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

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

%F k=3: a(n) = 3*a(n-1) +a(n-2) -6*a(n-3) +5*a(n-4) -2*a(n-5) -2*a(n-6) -a(n-7) for n>9

%F k=4: [order 15] for n>18

%F k=5: [order 35] for n>40

%F k=6: [order 87] for n>91

%e Some solutions for n=4 k=4

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

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

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

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

%Y Column 1 is A000045(n-1).

%Y Column 2 is A078039(n-2).

%K nonn,tabl

%O 1,7

%A _R. H. Hardin_, Dec 25 2016

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