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 A100009 #28 Dec 14 2024 16:29:09 %S A100009 2,5,70,1088430,58478088289964410654020 %N A100009 a(1) = 2; for n >= 2, a(n) = f(a(n-1)) where f(n) = n*(n+1)*(n+2)*(n+3)/24. %C A100009 The next term has 90 digits. %t A100009 NestList[(6 #+11 #^2+6 #^3+#^4)/24&,2,6] (* _Harvey P. Dale_, Dec 14 2024 *) %Y A100009 Cf. A000332. %K A100009 easy,nonn,less %O A100009 1,1 %A A100009 _Jonathan Vos Post_, Nov 16 2004