41803776000domain: NAppears in sequencesPermanent of the n-th principal submatrix of A204435.at n=16A204436Permanent of the n-th principal submatrix of A204439.at n=16A204440a(n) = a(n-1) * a(n-2) * (1 - 2 / (n * (n-1))), with a(1) = 2, a(2) = 3.at n=8A380023