47535445domain: NAppears in sequencesa(n) = 4*a(n-1) + 1, a(1)=11.at n=11A072262a(n) = (n + 2/3)*2^(n-1) - 1/2 - (-1)^(n-1)*(1/6).at n=21A127980Decimal representation of the middle column of the "Rule 59" elementary cellular automaton starting with a single ON (black) cell.at n=25A266721