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%I #16 May 10 2020 11:46:39
%S 2,2,3,2,15,15,21,16,9,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,
%T 50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,
%U 96,98,100,102,104,106,108,110,112,114,116,118,120,122,124,126
%N Eventual period of a single cell in rule 25 cellular automaton in a cyclic universe of width n.
%C _Bradley Klee_ computed a(1)-a(10).
%D Bradley Klee, Posting to Math Fun Mailing List, Apr 26 2020
%F Conjectures from _Colin Barker_, May 09 2020: (Start)
%F G.f.: x*(2 - 2*x + x^2 - 2*x^3 + 14*x^4 - 13*x^5 + 6*x^6 - 11*x^7 - 2*x^8 + 18*x^9 - 9*x^10) / (1 - x)^2.
%F a(n) = 2*a(n-1) - a(n-2) for n>11.
%F (End)
%F Conjecture: for n>=10, a(n) = 2*n. - _Vaclav Kotesovec_, May 10 2020
%Y Cf. A180001, A334496, A334499-A334515.
%K nonn
%O 1,1
%A _N. J. A. Sloane_, May 05 2020
%E More terms from _Jinyuan Wang_, May 09 2020
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