1419873domain: NAppears in sequencesa(0)=1, a(1)=1, a(n) = 17*a(n/2) for n=2,4,6,..., a(n) = 16*a((n-1)/2) + a((n+1)/2) for n=3,5,7,....at n=33A116523a(n) = n^5 + n - 1.at n=17A271208a(n) = Sum_{k=1..n} gcd(k, n)^5.at n=16A343499