reviewed
approved
proposed
editing
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.
a(n) is also the number of odd entries in row n of A035343. - _Leon Rische_ _, Feb 02 2023
a(n) is also the number of odd entries in row n of A035343. - Leon Rische Feb 02 2023