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 A002823 M2357 N0933 #24 Jan 29 2022 01:01:07 %S A002823 1,1,3,4,9,14,27,48,93,163,315,576,1085 %N A002823 Number of period-n solutions to a certain "universal" equation related to transformations on the unit interval. %C A002823 a(n) <= A000048(n), since the solutions counted here are a subset of the solutions counted by A000048 (called U sequence in the paper). The observed equality for prime n means that there are in this case no harmonics, which would disappear. - _M. F. Hasler_, Nov 05 2014 %D A002823 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002823 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002823 N. Metropolis, M. L. Stein and P. R. Stein, <a href="http://dx.doi.org/10.1016/0097-3165(73)90033-2">On finite limit sets for transformations on the unit interval</a>, J. Combin. Theory, A 15 (1973), 25-44; reprinted in P. Cvitanovic, ed., Universality in Chaos, Hilger, Bristol, 1986, pp. 187-206. %H A002823 P. R. Stein, <a href="/A000048/a000048.pdf">Letter to N. J. A. Sloane, Jun 02 1971</a> %Y A002823 Cf. A000048, A001372. %K A002823 nonn,nice,more %O A002823 3,3 %A A002823 _N. J. A. Sloane_