45197460domain: NAppears in sequencesa(n) = (2*n-1)^2 * a(n-1) - 3*C(2*n-1,3) * a(n-2) for n>1; a(0) = a(1) = 1.at n=6A002370Number of terms in the expansion of the determinant of a skew-symmetric matrix of order n.at n=11A167028