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 A164906 #25 Jun 02 2025 01:53:43 %S A164906 1,4,4,16,16,64,64,256,256,1024,1024,4096,4096,16384,16384,65536, %T A164906 65536,262144,262144,1048576,1048576,4194304,4194304,16777216, %U A164906 16777216,67108864,67108864,268435456,268435456,1073741824,1073741824,4294967296 %N A164906 Duplicate of A056450. %K A164906 dead %O A164906 0,2