235085301451domain: NAppears in sequencesa(n) = (36^n/6)*B(2n,1/6)/B(2n) where B(n,x) is the n-th Bernoulli polynomial and B(k) = B(k,0) is the k-th Bernoulli number.at n=7A096054a(n) = sigma(6^(n-1)).at n=14A160869a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 16.at n=5A161139