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 A186301 #11 Jun 27 2020 16:34:23 %S A186301 3,11,27,35,51,59,99,107,147,155,171,179,195,227,267,275,291,315,347, %T A186301 371,387,395,419,459,507,539,555,611,651,659,675,699,707,731,755,771, %U A186301 795,819,827,851,875,939,995,1011,1019,1059,1067,1091,1107,1115,1179,1211 %N A186301 a(n) = A007521(n) - 2. %Y A186301 Cf. A007521. %K A186301 nonn %O A186301 1,1 %A A186301 _Marco Matosic_, Feb 17 2011 %E A186301 a(52) corrected by _Georg Fischer_, Jun 27 2020