# A335786 (b-file synthesized from sequence entry)
1 1
2 2
3 12
4 72
5 570
6 6420
7 73710
8 1062880
9 16152192
10 295701840
11 5972551200
12 142376439744
13 3404745197568
14 93970796984064
15 2607611074548480
16 81965344295577600
17 2592539062735564800
18 91576434008178662400
19 3254436161821209530880
20 127719736848201606451200