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 A056319 #6 Aug 22 2017 20:53:08 %S A056319 0,0,3,18,78,270,921,2898,9147,27987,85773,259557,785778,2366892, %T A056319 7128120,21425040,64382550,193316685,580372293,1741819245,5227115454, %U A056319 15684238080,47059266081,141189599250 %N A056319 Number of primitive (aperiodic) reversible strings with n beads using exactly three different colors. %C A056319 Each string and its reverse are considered to be equivalent. %D A056319 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 A056319 Sum mu(d)*A056310(n/d) where d|n. %Y A056319 Cf. A056314. %K A056319 nonn %O A056319 1,3 %A A056319 _Marks R. Nester_