122078125domain: NAppears in sequencesa(n) = (5^n + 5^floor(n/2))/2.at n=12A001447Number of reversible strings with n beads of 5 colors.at n=12A032122a(n) = (n^6 + n^3)/2.at n=25A071232a(n) = (n^12 + n^6)/2.at n=5A071235