# A145630 (b-file synthesized from sequence entry)
1 2
2 12
3 60
4 840
5 2520
6 2520
7 32760
8 65520
9 1113840
10 4232592
11 4232592
12 97349616
13 2433740400
14 7301221200
15 211735414800
16 13127595717600
17 13127595717600
18 13127595717600
19 485721041551200
20 485721041551200
21 19914562703599200