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 A056522 #13 Oct 01 2019 19:50:07 %S A056522 0,0,0,0,0,0,0,1,1,10,15,85,140,618,1050,4064,6951,24914,42525,145057, %T A056522 246730,814200,1379400,4446545,7508501,23798460,40075034,125435695, %U A056522 210766920,653516168,1096190550,3374551384,5652751636,17305626334,28958095545,88274117232 %N A056522 Number of primitive (period n) periodic palindromic structures using exactly five different symbols. %D A056522 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 A056522 Andrew Howroyd, <a href="/A056522/b056522.txt">Table of n, a(n) for n = 1..200</a> %F A056522 a(n) = A056516(n) - A056515(n). %F A056522 Moebius transform of A056511. - _Andrew Howroyd_, Oct 01 2019 %e A056522 For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure. This should be different from A056511. %Y A056522 Column 5 of A285037. %Y A056522 Cf. A056484, A056511, A056515, A056516. %K A056522 nonn %O A056522 1,10 %A A056522 _Marks R. Nester_ %E A056522 a(17)-a(28) from _Andrew Howroyd_, Apr 09 2017 %E A056522 Terms a(29) and beyond from _Andrew Howroyd_, Oct 01 2019