# A069731 (b-file synthesized from sequence entry)
1 1
2 5
3 28
4 168
5 1056
6 6864
7 45760
8 311168
9 2149888
10 15049216
11 106502144
12 760729600
13 5477253120
14 39710085120
15 289650032640
16 2124100239360
17 15651264921600
18 115819360419840
19 860372391690240