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 A079172 #11 Mar 02 2020 07:35:43 %S A079172 0,8,19570,4294963804,298023223876769393, %T A079172 10314424798490535546154887938, %U A079172 256923577521058878088611477224227878265543,6277101735386680763835789423207666416102355296268686994710,196627050475552913618075908526912116283103450944214766927276968172610579252347 %N A079172 Number of non-associative closed binary operations on a set of order n. %C A079172 Each a(n) is equal to the sum of the products of each element in row n of A079174 and the corresponding element of A079210. %H A079172 C. van den Bosch, <a href="http://cosmos.ucc.ie/~cjvdb1/html/binops.shtml">Closed binary operations on small sets</a> %H A079172 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a> %F A079172 a(n) = A002489(n) - A023814(n). %Y A079172 Cf. A023814, A079173, A079174. %K A079172 nonn %O A079172 1,2 %A A079172 Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003 %E A079172 More terms from _Christian G. Bower_, Nov 26 2003 %E A079172 More terms from _Jinyuan Wang_, Mar 02 2020