45902domain: NAppears in sequencesNumbers m such that gcd(s1,s2) = number of the Collatz iterations of m where s1 is the sum of the odd terms and s2 the sum of the even terms in the Collatz trajectory.at n=9A281195E.g.f.: exp(1 + x + x^2/2! - exp(x)).at n=13A293038