# A139231 (b-file synthesized from sequence entry) 1 4 2 24 3 96 4 8064 5 122880 6 393216 7 2146959360 8 2305843007066210304 9 618970017336847128235868160 10 162258657859193720701440560726016 11 170141021201192402518323912137873817600