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 A329202 #8 Nov 08 2019 02:45:07 %S A329202 0,2,3,4,4,5,5,6,6,6,6,7,7,7,7,8,8,8,8,8,8,8,9,9,9,9,9,9,9,9,9,10,10, %T A329202 10,10,10,10,10,10,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,11,11, %U A329202 11,11,11,11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12 %N A329202 a(n) = floor(2*log_2(n)) = floor(log_2(n^2)). %o A329202 (PARI) a(n)=logint(n^2,2) %Y A329202 Cf. A017912, A328911 (has this as row lengths). %K A329202 nonn,easy %O A329202 1,2 %A A329202 _M. F. Hasler_, Nov 07 2019