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 A056340 #9 Aug 22 2017 20:53:09 %S A056340 0,0,0,0,0,1,12,142,1346,11511,89974,662673,4662574,31724723, %T A056340 210361046,1367510184,8752976610,55343946628,346541488998, %U A056340 2153041576027,13292844257186,81652683460145,499484958151630 %N A056340 Number of primitive (aperiodic) reversible string structures with n beads using exactly six different colors. %C A056340 A string and its reverse are considered to be equivalent. Permuting the colors will not change the structure. %D A056340 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 A056340 A056335(n)-A056334(n). %Y A056340 Column 6 of A276544. %Y A056340 Cf. A056322. %K A056340 nonn %O A056340 1,7 %A A056340 _Marks R. Nester_