8573157376domain: NAppears in sequencesa(n) = 8^(n-1)*(2^n - 1).at n=8A060195a(n) = 4^(n-2)*n*(5*n+3)/2.at n=14A084901Number of Pythagorean triples mod 2^n; i.e., number of solutions to x^2 + y^2 = z^2 mod 2^n.at n=16A091143a(n) = Sum_{d|n} Moebius(n/d)*d^(b-1)/phi(n) for b = 10.at n=15A160953