21806domain: NAppears in sequencesa(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,-1,1,1.at n=24A025278Numbers k such that 297*2^k-1 is prime.at n=42A050907Maximal number of regions into which 4-space can be divided by n hyperspheres.at n=24A059173