# A145612 (b-file synthesized from sequence entry)
1 1
2 6
3 15
4 420
5 63
6 1386
7 9009
8 360360
9 1531530
10 29099070
11 14549535
12 1338557220
13 1673196525
14 10039179150
15 145568097675
16 72201776446800
17 18050444111700
18 9025222055850
19 166966608033225
20 667866432132900
21 6845630929362225