70780domain: NAppears in sequencesa(n) = number of distinct prime divisors (taken together) of numbers of the form x^2+1 for x<=10^n.at n=4A144848Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=20A192952Number of minimal total dominating sets in the n X n queen graph.at n=5A347919