# A193987 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 120
6 60
7 7560
8 360
9 1260
10 2520
11 294053760
12 5040
13 128501493120
14 332640
15 110880
16 55440
17 106858629141264000
18 277200
19 188391763176048432000
20 720720
21 21621600
22 27935107200
23 1356699703068812438127792000
24 3603600
25 857656800
26 18632716502400
27 6983776800
28 183783600