# A101612 (b-file synthesized from sequence entry)
2 3
3 11
4 26
5 154
6 684
7 5508
8 35664
9 361296
10 3068640
11 37383840
12 392722560
13 5584394880
14 69878833920
15 1135360800000
16 16484477184000
17 301158902016000
18 4976250951168000
19 100951141777920000
20 1870345490614272000