# A145499 (b-file synthesized from sequence entry)
1 1
2 2
3 3
4 6
5 30
6 120
7 840
8 3360
9 13440
10 134400
11 739200
12 6652800
13 86486400
14 778377600
15 16345929600
16 81729648000
17 1389404016000
18 12504636144000
19 79196028912000
20 1267136462592000
21 81096733605888000
22 3649353012264960000