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 A056482 #10 Aug 22 2017 20:53:13 %S A056482 0,0,0,0,1,1,6,6,25,24,90,89,301,295,965,960,3025,2999,9330,9305, %T A056482 28495,28411,86526,86430,261624,261324,788945,788669,2375101,2374110, %U A056482 7141686 %N A056482 Number of primitive (aperiodic) palindromic structures using exactly three different symbols. %C A056482 Permuting the symbols will not change the structure. %D A056482 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 A056482 A056477(n)-A056476(n). %Y A056482 Column 3 of A284826. %Y A056482 Cf. A056464. %K A056482 nonn %O A056482 1,7 %A A056482 _Marks R. Nester_