5422144domain: NAppears in sequencesa(n) = Product_{d|n, d^2<=n} (d+n/d); a(1)=1.at n=47A050214Numerator of the expected number of random moves in Tower of Hanoi problem with n disks starting on peg 1 and ending on peg 3.at n=6A134939a(n) = Product_{k=1..n} (3*k^2+1).at n=5A277353