# A358264 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 9
4 48
5 315
6 2520
7 23415
8 248640
9 2972025
10 39463200
11 576413145
12 9184855680
13 158550787395
14 2947473809280
15 58707685211175
16 1247293022976000
17 28156003910859825
18 672972205556851200
19 16978695795089253225
20 450907982644863744000
21 12573634144960773960075