# A138903 (b-file synthesized from sequence entry)
1 1
2 3
3 21
4 234
5 3590
6 70254
7 1672972
8 46955760
9 1517994792
10 55549351800
11 2269918543640
12 102452561694864
13 5062050729973120
14 271751784988056576
15 15750949414628405760
16 980315266648197537792
17 65207656047198387921536