4237316640domain: NAppears in sequencesa(n) is the permanent of the square matrix A(n) of order 2*n whose generic entry is A(i, j) = n*(2*i - (-1)^i - 3) + 2*j - (-1)^j/2 + (-1)^i - 3/2 with 1 <= i,j <= 2*n.at n=3A390679