# A093593 (b-file synthesized from sequence entry)
1 1
2 3
3 15
4 84
5 660
6 4680
7 47880
8 463680
9 5261760
10 59875200
11 858211200
12 11256537600
13 183697113600
14 2833294464000
15 47730114432000
16 847372990464000
17 17250840262656000
18 329722245844992000
19 7359528574734336000
20 156922179527393280000
21 3601911423105515520000
22 84862054947209379840000