137422176256domain: NAppears in sequencesa(n) = 4^(n-1)*(2^n-1).at n=13A016152a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 14.at n=7A161010Expansion of (1+16*x)/((1+4*x)*(1-8*x)).at n=12A271494