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 A108228 #8 Apr 13 2022 20:09:28 %S A108228 0,1,2,4,3,7,5,13,12,10,6,22,8,16,17,40,9,37,11,31,27,19,14,67,24,25, %T A108228 62,49,15,52,18,121,32,28,38,112,20,34,42,94,21,82,23,58,87,43,26,202, %U A108228 60,73,47,76,29,187,45,148,57,46,30,157,33,55,137,364,59,97,35,85,72 %N A108228 a(n) = (A003961(n) - 1)/2, a permutation of the nonnegative integers. %Y A108228 Cf. A003961. Equals A048673(n)-1. %K A108228 nonn %O A108228 1,3 %A A108228 _Leroy Quet_, Jun 16 2005