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 A022486 #8 May 17 2019 08:15:02 %S A022486 0,0,0,0,0,0,1,1,2,5,6,9,12,16,22,27,37,47,60,81,108,143,190,266,352, %T A022486 463,613,812,1086,1419,1873,2509,3328,4399,5836,7780,10328,13672, %U A022486 18148,24110,32066,42426,56269,74791,99188,131518,174439,231657 %N A022486 Number of 3's in n-th term of A022482. %Y A022486 Cf. A022482, A316864. %K A022486 nonn,base %O A022486 1,9 %A A022486 _Clark Kimberling_ %E A022486 More terms from _Sean A. Irvine_, May 16 2019