# A145223 (b-file synthesized from sequence entry)
2 0
3 0
4 6
5 0
6 90
7 420
8 3780
9 33264
10 333900
11 3670920
12 44054010
13 572697840
14 8017775766
15 120266628300
16 1924266063720
17 32712523068960
18 588825415259640
19 11187682889909904
20 223753657798227150
21 4698826813762734240
22 103374189902780197170
23 2377606367763944481780