# A375303 (b-file synthesized from sequence entry)
1 0
2 1
3 4
4 20
5 108
6 678
7 4848
8 39264
9 355920
10 3575640
11 39454560
12 474501600
13 6178566240
14 86606881200
15 1300352981760
16 20821540239360
17 354184575816960
18 6378546460970880
19 121243261343500800
20 2425719783585369600
21 50955334461183398400
22 1121303792572973856000
23 25795667534014525593600