853546domain: NAppears in sequencesNumbers k such that 19*2^k+1 is prime.at n=18A032359a(n) = [x^n] Product_{k>=1} ((1 + x^k)/(1 + x^(4*k)))^n.at n=11A304628Number of maximal subsets of {1..n} such that every orderless pair of distinct elements has a different sum.at n=40A325878