45746domain: NAppears in sequencesNumber of ways writing 2^n as unordered sums of 2 primes.at n=24A006307Number of Goldbach partitions of 4^n.at n=12A195295a(n) is the numerator of the sum of reciprocals of primes not exceeding n and not dividing binomial(2*n, n).at n=32A334074