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 A273965 #4 Jun 05 2016 14:36:38 %S A273965 2,10,105,1264,13045,136063,1273961,11936399,95697853,800561388, %T A273965 5824237329,42821430074,277065391875 %N A273965 Number of nX2 0..3 arrays with no three equal values forming an isosceles triangle, and new values introduced in 0..3 order. %C A273965 Column 2 of A273968. %e A273965 Some solutions for n=4 %e A273965 ..0..1. .0..1. .0..0. .0..1. .0..1. .0..0. .0..0. .0..1. .0..0. .0..1 %e A273965 ..2..3. .2..1. .1..2. .2..1. .1..2. .1..2. .1..1. .2..2. .1..1. .0..2 %e A273965 ..2..3. .0..0. .3..0. .3..3. .3..2. .1..2. .2..0. .1..0. .0..2. .0..2 %e A273965 ..3..1. .2..3. .3..2. .1..1. .2..0. .0..3. .2..1. .1..0. .1..3. .1..2 %Y A273965 Cf. A273968. %K A273965 nonn %O A273965 1,1 %A A273965 _R. H. Hardin_, Jun 05 2016