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 A213532 #7 Feb 04 2017 01:21:14 %S A213532 0,0,454,698,8137,90324,946964,9705879,97790090,977682518,9730782305 %N A213532 Number of k < 10^n such that A047988(k) = 3. %D A213532 Thomas Kantke, Mathematische Unterhaltungen, in: Spektrum der Wissenschaft 4/1993, p. 11-13. %D A213532 Thomas Kantke, Das Spiel Minimum, in: Spektrum der Wissenschaft Spezial Physik - Mathematik - Technik 2/2012, pp. 57-66. %Y A213532 Cf. A047986, A047988, A212524, A213530, A213531, A213533. %K A213532 nonn %O A213532 1,3 %A A213532 _Martin Renner_, Jun 13 2012