# A233823 (b-file synthesized from sequence entry)
2 47
3 251
4 1361
5 7817
6 46877
7 280591
8 1680131
9 10077959
10 60470441
11 362797949
12 2176786421
13 13060695047
14 78364167257
15 470184984721
16 2821109908277
17 16926659446819
18 101559956670517
19 609359740010929
20 3656158440066719
21 21936950640380099
22 131621703842267647
23 789730223053605439