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 A056485 #10 Aug 22 2017 20:53:13 %S A056485 0,0,0,0,0,0,0,0,0,0,1,1,21,21,266,266,2646,2646,22827,22827,179487, %T A056485 179486,1323652,1323651,9321312,9321291,63436373,63436352,420693273, %U A056485 420693007,2734926558 %N A056485 Number of primitive (aperiodic) palindromic structures using exactly six different symbols. %C A056485 Permuting the symbols will not change the structure. %D A056485 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] %F A056485 A056480(n)-A056479(n). %Y A056485 Column 6 of A284826. %Y A056485 Cf. A056467. %K A056485 nonn %O A056485 1,13 %A A056485 _Marks R. Nester_