# A374650 (b-file synthesized from sequence entry)
3 1
4 14
5 82
6 528
7 3864
8 31920
9 294480
10 3003840
11 33586560
12 408602880
13 5374252800
14 76001587200
15 1150082841600
16 18544067942400
17 317416158259200
18 5748536521728000
19 109823724122112000
20 2207396178763776000
21 46564463961759744000
22 1028630969057083392000