# A069996 (b-file synthesized from sequence entry)
1 1
2 12
3 81
4 432
5 2025
6 8748
7 35721
8 139968
9 531441
10 1968300
11 7144929
12 25509168
13 89813529
14 312487308
15 1076168025
16 3673320192
17 12440502369
18 41841412812
19 139858796529
20 464904586800
21 1537671920841
22 5062810950252
23 16600580533161