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 A003208 M4122 #18 Feb 02 2022 09:00:19 %S A003208 1,6,18,54,162,456,1302,3630,10158,27648,77022,206508,570072,1521822 %N A003208 Cluster series for bond percolation problem on diamond. %D A003208 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 A003208 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A003208 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 A003208 M. F. Sykes, D. S. Gaunt and M. Glen, <a href="https://doi.org/10.1088/0305-4470/9/10/021">Percolation processes in three dimensions</a>, J. Phys. A: Math. Gen., 9 (1976), 1705-1712. %H A003208 <a href="/index/Di#diamond">Index entries for sequences related to diamond structure</a> %Y A003208 Cf. A003205 (f.c.c.), A003206 (b.c.c.), A003207 (simple cubic), A003212 (site percolation). %K A003208 nonn,more %O A003208 0,2 %A A003208 _N. J. A. Sloane_ %E A003208 Name clarified, a(12)-a(13) from Sykes, Gaunt & Glen added by _Andrey Zabolotskiy_, Feb 02 2022