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 A060152 #6 Oct 28 2022 20:52:51 %S A060152 1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,62914, %T A060152 65535,131071,262143,524287,716479,1048575,1132639,2069471,2097151, %U A060152 3618111,4194303,8388607 %N A060152 Nim-factorial(a(n))=1. %C A060152 Except for the term a(16)=62914, all listed terms agree with those of A000225: 2^n - 1. %Y A060152 A059970 (Nim-factorials), A055010. %K A060152 nonn %O A060152 1,2 %A A060152 _John W. Layman_, Mar 09 2001 %E A060152 a(18)-a(28) from _Sean A. Irvine_, Oct 28 2022