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 A246597 #11 Sep 12 2014 10:43:16 %S A246597 1,3,6,12,22,39,78,132,269,526,1036,2067,4162,8252,16387,32662,65372, %T A246597 130953,262212,524550,1047850,2097353,4192505,8384471 %N A246597 A070952(2^n-1). %C A246597 Arises from studying behavior of 1-D CA defined by Rule 30 when started with a single ON cell. %C A246597 I would very much like to see a recurrence or formula. %C A246597 Subtracting 2^n gives 0, 1, 2, 4, 6, 7, 14, 4, 13, 14, 12, 19, 66, 60, ... %Y A246597 Cf. A070952, A246024, A246023. %K A246597 nonn,more %O A246597 0,2 %A A246597 _N. J. A. Sloane_, Sep 06 2014 %E A246597 a(14)-a(23) from _Hiroaki Yamanouchi_, Sep 12 2014