461313domain: NAppears in sequencesa(n) is the difference between multiples of 9 with even and odd digit sum in base 8 in interval [0,8^n).at n=8A212593a(n) is the difference between numbers of nonnegative multiples of 2*n+1 with even and odd digit sum in base 2*n in interval [0, (2*n)^9).at n=3A212706