# A131928 (b-file synthesized from sequence entry)
0 0
1 1
2 4
3 16
4 96
5 288
6 1440
7 5760
8 23040
9 92160
10 552960
11 1658880
12 7299072
13 36495360
14 109486080
15 510935040
16 2043740160
17 7664025600
18 28740096000
19 114960384000
20 459841536000
21 1839366144000
22 8583708672000
23 38626689024000