> Blindly using the second (of three) Mathematica formulation in A008284, I'd guess (based on a half-day run) that it would take me about three days. It ended up taking more than a week! Jonathan, If you want to check it against your 3-minute output, I'll put my A008284(10000) here: http://chesswanks.com/num/a008284(10000).txt