195955200domain: NAppears in sequencesNumber of n X n (real) {0,1}-matrices having determinant A003432(n).at n=8A051752Let d(m, 0) = 1, d(m, 1) = m, and d(m, k) = (m - k + 1)*d(m+1, k-1) - (k-1)*(m+1) d(m+2, k-2). Sequence gives d(3,n).at n=10A127068