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 A300418 #14 Dec 11 2019 05:10:13 %S A300418 0,0,1,11,34,107,312,882,2457,6504,17206,46073,123868,334567,915443, %T A300418 2520503,7002043,19604493,55264235 %N A300418 Number of semiprime Fermat pseudoprimes to base 2 (A214305) less than 10^n. %H A300418 Jan Feitsma, <a href="http://www.janfeitsma.nl/math/psp2/statistics">The pseudoprimes below 2^64 - statistics</a>. %H A300418 William F. Galway, <a href="https://faculty.math.illinois.edu/~galway/SlidesETC/pq-psp-slides.pdf">The Density of Pseudoprimes with Two Prime Factors</a>. %H A300418 Aran Nayebi, <a href="https://arxiv.org/abs/0906.3533v21">On the distribution of Carmichael numbers</a>, arXiv preprint arXiv:0906.3533 [math.NT], 2009-2013. But beware of errors! %Y A300418 Cf. A055550, A214305. %K A300418 nonn,more %O A300418 1,4 %A A300418 _Amiram Eldar_, Mar 05 2018 %E A300418 Corrected and extended by _Daniel Suteu_, Dec 10 2019