275122domain: NAppears in sequencesa(n) = sigma(2*n^4) - sigma(n^4).at n=18A224903E.g.f.: Sum_{n>=0} (exp(n*x) + 1)^n * exp(-x*exp(n*x)) * x^n / n!.at n=7A326428Fibonacci with binary selection.at n=22A327665