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 A246023 #15 Jun 22 2022 01:39:51 %S A246023 3,3,4,7,15,26,64,132,253,498,1033,2027,4089,8141,16416,32715,65722, %T A246023 131374,262159,524211,1048630,2097291,4195039,8387885 %N A246023 a(n) = A070952(2^n). %C A246023 Arises from studying behavior of 1-D CA defined by Rule 30 when started with a single ON cell. %C A246023 I would very much like to see a recurrence or formula. %C A246023 Subtracting 2^n gives 2, 1, 0, -1, -1, -6, 0, 4, -3, -14, 9, -21, -7, -51, ... %Y A246023 Cf. A070952, A246024, A246597. %K A246023 nonn,more %O A246023 0,1 %A A246023 _N. J. A. Sloane_, Aug 14 2014 %E A246023 a(14)-a(23) from _Hiroaki Yamanouchi_, Sep 12 2014