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 A334496 #24 May 09 2020 05:11:37
%S A334496 1,1,1,8,5,1,4,40,72,15,154,102,260,1428,1455,6016,10846,2844,247,
%T A334496 3420,597,3256,38249,185040,588425,312156,240300,249165,833808,374265,
%U A334496 2841150,842528,1049268,5656002,18480630,2844,49276415,9329228,961272,19211080,51151354,109603410
%N A334496 Eventual period of a single cell in rule 30 cellular automaton in a cyclic universe of width n.
%C A334496 _Bradley Klee_ computed a(1)-a(10).
%D A334496 Bradley Klee, Posting to Math Fun Mailing List, Apr 26 2020
%H A334496 Bert Dobbelaere, <a href="/A334496/b334496.txt">Table of n, a(n) for n = 1..60</a>
%t A334496 a[rule_, n_] := -Subtract @@ Flatten[Map[ Position[#, #[[-1]]] &,
%t A334496 NestWhileList[CellularAutomaton[rule],
%t A334496 Prepend[Table[0, {n - 1}], 1], Unequal, All], {0}]]
%t A334496 a[30, #] & /@ Range[10]
%t A334496 (* _Bradley Klee_, Apr 26 2020 *)
%Y A334496 Cf. A085587, A180001, A334499-A334515.
%Y A334496 Cf. also A334497.
%K A334496 nonn
%O A334496 1,4
%A A334496 _N. J. A. Sloane_, May 05 2020
%E A334496 More terms from _Bert Dobbelaere_, May 09 2020