# A171005 (b-file synthesized from sequence entry) 3 4 4 15 5 72 6 420 7 2880 8 22680 9 201600 10 1995840 11 21772800 12 259459200 13 3353011200 14 46702656000 15 697426329600 16 11115232128000 17 188305108992000 18 3379030566912000 19 64023737057280000 20 1277273554292736000 21 26761922089943040000 22 587545834974658560000 23 13488008733331292160000