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 A001321 M5196 N2260 #25 Jun 04 2023 15:11:14 %S A001321 27,10206,1271126683458,18476103676807778218052102700370958034, %T A001321 726580354049674651690925588215506430824419524245730549989258760312370548741057559799467925374036936715660160424670 %N A001321 Number of equivalence classes of 3-valued Post functions of n variables under action of symmetric group S_n. %D A001321 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001321 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001321 Michael A. Harrison, <a href="https://www2.eecs.berkeley.edu/Pubs/TechRpts/1963/28677.html">The number of Symmetry Types of Post Functions</a>, EECS Department, University of California, Berkeley, Technical Report No. UCB/ERL M29, 1963. %H A001321 M. A. Harrison and R. G. High, <a href="https://doi.org/10.1016/S0021-9800(68)80008-0">On the cycle index of a product of permutation groups</a>, J. Combin. Theory, 4 (1968), 277-299. %Y A001321 Cf. A001323, A056668 %K A001321 nonn %O A001321 1,1 %A A001321 _N. J. A. Sloane_ %E A001321 More terms from _Vladeta Jovovic_, Feb 04 2000 %E A001321 More specific definition by _Christian Sievers_, Jun 04 2023