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 A056483 #10 Aug 22 2017 20:53:13 %S A056483 0,0,0,0,0,0,1,1,10,10,65,65,350,349,1701,1700,7770,7760,34105,34095, %T A056483 145749,145685,611501,611435,2532530,2532180,10391735,10391395, %U A056483 42355950,42354239,171798901 %N A056483 Number of primitive (aperiodic) palindromic structures using exactly four different symbols. %C A056483 Permuting the symbols will not change the structure. %D A056483 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 A056483 A056478(n)-A056477(n). %Y A056483 Column 4 of A284826. %Y A056483 Cf. A056465. %K A056483 nonn %O A056483 1,9 %A A056483 _Marks R. Nester_