23068671domain: NAppears in sequencesa(n) = 11*2^n - 1.at n=21A086225a(n) = (n+1)*2^(n-1) - 1.at n=20A099035a(n) = 11*8^n-1.at n=7A198858Decimal representation of the middle column of the "Rule 233" elementary cellular automaton starting with a single ON (black) cell.at n=24A267880