# A145220 (b-file synthesized from sequence entry)
2 1
3 0
4 0
5 20
6 45
7 504
8 3640
9 33480
10 333585
11 3671360
12 44053416
13 572698620
14 8017774765
15 120266629560
16 1924266062160
17 32712523070864
18 588825415257345
19 11187682889912640
20 223753657798223920
21 4698826813762738020
22 103374189902780192781
23 2377606367763944486840