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 A056480 #10 Oct 02 2019 17:46:00
%S A056480 1,1,0,1,1,4,3,14,13,50,47,202,197,875,861,4105,4096,20647,20593,
%T A056480 109298,109246,601476,601289,3403126,3402911,19628059,19627188,
%U A056480 114700263,114699438,676207627,676203467,4010090462,4010086352,23874361996,23874341552,142508723632
%N A056480 Number of primitive (aperiodic) palindromic structures using a maximum of six different symbols.
%C A056480 Permuting the symbols will not change the structure.
%D A056480 M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia. [See A056391 for pdf file of Chap. 2]
%H A056480 Andrew Howroyd, <a href="/A056480/b056480.txt">Table of n, a(n) for n = 0..500</a>
%F A056480 a(n) = Sum_{d|n} mu(d)*A056471(n/d) for n > 0.
%F A056480 a(n) = Sum_{k=1..6} A284826(n, k) for n > 0. - _Andrew Howroyd_, Oct 02 2019
%Y A056480 Cf. A056462, A056471, A284826.
%K A056480 nonn
%O A056480 0,6
%A A056480 _Marks R. Nester_
%E A056480 a(0)=1 prepended and terms a(32) and beyond from _Andrew Howroyd_, Oct 02 2019