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A274955 Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-1) (-2,0) or (0,-2) and new values introduced in order 0..2. 1

%I #4 Jul 12 2016 08:02:28

%S 6,72,384,2376,14406,87780,536406,3278016,20027574,122367012,

%T 747675414,4568374272,27913169094,170551986900,1042088376006,

%U 6367256060400,38904520522614,237710201714820,1452431219269686,8874488478680352

%N Number of nX4 0..2 arrays with no element equal to any value at offset (-1,-1) (-2,0) or (0,-2) and new values introduced in order 0..2.

%C Column 4 of A274959.

%H R. H. Hardin, <a href="/A274955/b274955.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 6*a(n-1) +4*a(n-3) +13*a(n-4) -74*a(n-5) -8*a(n-6) -4*a(n-8) +8*a(n-9) for n>11

%e Some solutions for n=4

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

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

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

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

%Y Cf. A274959.

%K nonn

%O 1,1

%A _R. H. Hardin_, Jul 12 2016

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Last modified July 14 18:52 EDT 2024. Contains 374323 sequences. (Running on oeis4.)