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 A003209 M4853 #23 May 21 2025 09:19:44 %S A003209 1,12,84,504,3012,17142,96228,532028,2918388,15763956 %N A003209 Cluster series for f.c.c. lattice. %D A003209 J. W. Essam, Percolation and cluster size, in C. Domb and M. S. Green, Phase Transitions and Critical Phenomena, Ac. Press 1972, Vol. 2; see especially pp. 225-226. %D A003209 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A003209 M. F. Sykes and J. W. Essam, <a href="https://doi.org/10.1103/PhysRev.133.A310">Critical percolation probabilities by series methods</a>, Phys. Rev., 133 (1964), A310-A315. %H A003209 <a href="/index/Cl#cluster">Index entries for sequences related to cluster series</a>. %H A003209 <a href="/index/Fa#fcc">Index entries for sequences related to f.c.c. lattice</a>. %Y A003209 Row 33 of A383735. %K A003209 nonn,more %O A003209 0,2 %A A003209 _N. J. A. Sloane_ %E A003209 a(6)-a(9) from _Sean A. Irvine_, Aug 19 2020