Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/ElementaryCellularAutomaton.html">Elementary Cellular Automaton</a>
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N. J. A. Sloane, <a href="http://arxiv.org/abs/1503.01168">On the Number of ON Cells in Cellular Automata</a>, arXiv:1503.01168 [math.CO], 2015.
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Conjectures from Colin Barker, Dec 10 2017: (Start)
G.f.: (1 + 2*x^2)*(1 + 2*x + 4*x^3 - 8*x^4 - 8*x^5 + 24*x^6) / ((1 - x)*(1 - 2*x)*(1 + 2*x)*(1 + 4*x^2)).
a(n) = a(n-1) + 16*a(n-4) - 16*a(n-5) for n>4.
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