# A203715 (b-file synthesized from sequence entry)
1 1
2 3
3 6
4 34
5 120
6 1096
7 5040
8 56848
9 362880
10 5451136
11 39916800
12 688876288
13 6227020800
14 130789805056
15 1307674368000
16 29497569445888
17 355687428096000
18 9746045395173376
19 121645100408832000
20 3451902721622867968
21 51090942171709440000
22 1686006043164464644096