Let a(n) be A000479(n), the number of latin squares of order n with first row 1,2,...,n; given by 1,1,1,2,24,1344,... Let b(n) be the number of fixed latin squares of order n, i.e., latin squares of order n having all 1's on the diagonal. By direct enumeration, b(n) = a(n) for 1<=n<=5. Does b(n) = a(n) in general? Cheers, -Eric