This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A275145 #4 Jul 17 2016 16:28:52 %S A275145 41,1296,2000,5248,9744,32384,107472,362176,1220752,4108688,13848016, %T A275145 46763600,158042960,534108640,1804746272,6098041456,20605419360, %U A275145 69627945984,235280517632,795033992240,2686484835680,9077858469008 %N A275145 Number of 5Xn 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2. %C A275145 Row 5 of A275142. %H A275145 R. H. Hardin, <a href="/A275145/b275145.txt">Table of n, a(n) for n = 1..210</a> %F A275145 Empirical: a(n) = 8*a(n-1) -27*a(n-2) +56*a(n-3) -75*a(n-4) +61*a(n-5) -28*a(n-6) +7*a(n-7) -a(n-8) for n>12 %e A275145 Some solutions for n=5 %e A275145 ..0..1..2..1..0. .0..1..0..1..0. .0..1..0..1..2. .0..1..0..2..1 %e A275145 ..0..1..2..0..1. .0..2..1..0..1. .0..2..1..2..1. .0..2..1..0..2 %e A275145 ..2..0..1..2..0. .0..2..1..0..2. .1..2..1..0..2. .1..0..2..0..2 %e A275145 ..1..0..1..2..0. .1..0..2..0..2. .1..0..2..1..0. .2..1..2..1..0 %e A275145 ..1..2..0..2..0. .0..1..2..1..0. .2..1..2..1..0. .0..2..0..2..0 %Y A275145 Cf. A275142. %K A275145 nonn %O A275145 1,1 %A A275145 _R. H. Hardin_, Jul 17 2016