-656015360domain: ZAppears in sequencesa(n) = Sum_{i=1..n} (Product_{j=1..n} M(j, ((i+j-2) mod n)+1) - Product_{j=1..n} M(j, ((i-j-1) mod n)+1)) where M is the n X n matrix with numbers 1, 2, ..., n^2 in order across rows.at n=8A389261