1416468496domain: NAppears in sequencesa(n) = (10*n + 4)^4.at n=19A017320a(n) = (11*n + 7)^4.at n=17A017476a(n) = (12*n + 2)^4.at n=16A017548a(n) = sqrt( Product_{j=1..n} Product_{k=1..4} (4*sin((2*j-1)*Pi/(2*n))^2 + 4*sin((2*k-1)*Pi/4)^2) ).at n=7A341544