# A052638 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 18
4 96
5 960
6 11520
7 161280
8 2580480
9 46448640
10 928972800
11 20437401600
12 490497638400
13 12752938598400
14 357082280755200
15 10712468422656000
16 342798989524992000
17 11655165643849728000
18 419585963178590208000