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 A182283 #12 Apr 23 2018 14:22:44 %S A182283 1,1,15,3429,18172005,3030361658604,20538495213667066533, %T A182283 7069329642959332230532689983,150574890630606350105309341350824904669, %U A182283 237075065354315062816111131522815337395866137560373,32430625006159571889921247597353572731767630164652210957593666925 %N A182283 Number of triangular n X n X n arrays colored with integers 0 upwards introduced in row major order, with no element equal to any neighbor. %e A182283 Some solutions for n=4 %e A182283 .....0........0........0........0........0........0........0........0 %e A182283 ....1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2 %e A182283 ...2.0.3....3.4.0....2.0.1....0.3.4....3.4.0....3.4.0....3.4.5....3.4.0 %e A182283 ..3.1.4.1..4.2.5.4..3.1.3.0..4.5.2.5..0.5.3.6..4.5.3.6..5.0.2.1..1.2.3.5 %Y A182283 Cf. A182797, A193283. %K A182283 nonn %O A182283 1,3 %A A182283 _R. H. Hardin_, Apr 23 2012 %E A182283 a(7)-a(11) from _Andrew Howroyd_, Apr 23 2018