147548174400domain: NAppears in sequencesa(1) = 0, a(2) = 16, a(2n+1) = 10*a(2n) - a(2n-1), a(2n) = 10*a(2n-1) - a(2n-2) + 16.at n=11A053410A204519(n)^2 = floor(A055851(n)/6): Squares which written in base 6, with some digit appended, yield another square.at n=20A204573