# A100918 (b-file synthesized from sequence entry)
1 1
2 1
3 2
4 24
5 64
6 540
7 8640
8 34560
9 103680
10 3326400
11 23224320
12 96768000
13 764225280
14 24385536000
15 108391219200
16 1097349120000
17 29847896064000
18 1631977611264000
19 12384682168320000
20 8034351316992000
21 36502221127680000