# A232688 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 24
4 160
5 1100
6 9168
7 84336
8 868544
9 9806688
10 120754080
11 1608251040
12 23036978688
13 353070167424
14 5764504370688
15 99875064159360
16 1830107743518720
17 35360088597841920
18 718450398365755392
19 15313427783968370688
20 341652563064038062080
21 7962756873168407869440