# A100621 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 8
4 90
5 288
6 840
7 17280
8 28350
9 89600
10 598752
11 17418240
12 63063000
13 402361344000
14 5003856000
15 295206912
16 976924698750
17 342372925440000
18 15209113920000
19 5377993912811520000
20 96852084769440
21 89903156428800000
22 37556196837868800000
23 73570956727261593600000