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 A000947 #18 Oct 16 2015 03:15:40
%S A000947 1,2,4,10,15,44,56,177,212,706,792,2714,2961
%N A000947 Number of free nonplanar polyenoids with n nodes and symmetry point group C_{2v}.
%H A000947 S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="http://dx.doi.org/10.1021/ci00026a012">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751.
%H A000947 S. J. Cyvin, J. Brunvoll, E. Brendsdal, B. N. Cyvin and E. K. Lloyd, <a href="/A002057/a002057.pdf">Enumeration of polyene hydrocarbons: a complete mathematical solution</a>, J. Chem. Inf. Comput. Sci., 35 (1995) 743-751. [Annotated scanned copy]
%F A000947 a(n) = A000063(n + 2) - A000936(n). - _Sean A. Irvine_, Oct 15 2015
%K A000947 nonn,more
%O A000947 7,2
%A A000947 E. K. Lloyd (E.K.Lloyd(AT)soton.ac.uk)
%E A000947 a(16)-a(19) and title improved by _Sean A. Irvine_, Oct 16 2015