90113domain: NAppears in sequencesn is equal to the number of 1's in all numbers <= n written in base 8.at n=20A014885a(n) = T(7,n), array T given by A048472.at n=11A048479a(n) = 11*2^n + 1.at n=13A083683a(n) = 2*a(n-1) - 1 for n>1, a(1)=23.at n=12A122041Records in A001481 that are more than twice the previous record.at n=15A272268