1884211domain: NAppears in sequencesa(n) is the constant term in the expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^n.at n=4A350305a(n) is the constant term in expansion of Product_{k=1..n} (x^k + 1 + 1/x^k)^4.at n=4A369373