# A091746 (b-file synthesized from sequence entry) 1 1 2 30 3 12 4 1 5 2700 6 1920 7 426 8 36 9 1 10 491400 11 478800 12 162540 13 25344 14 1956 15 72 16 1 17 150368400 18 181440000 19 80451000 20 17624880 21 2130660 22 147840 23 5820 24 120 25 1 26 69470200800 27 98424849600 28 52905560400 29 14618016000 30 2346624000 31 232202880