# A101657 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 12
4 60
5 180
6 900
7 1800
8 3600
9 18000
10 54000
11 162000
12 486000
13 2430000
14 4860000
15 9720000
16 29160000
17 58320000
18 116640000
19 583200000
20 1749600000
21 5248800000
22 10497600000
23 31492800000
24 62985600000
25 188956800000