# A145148 (b-file synthesized from sequence entry)
7 1
8 21
9 322
10 4536
11 68313
12 1123815
13 19826015
14 368232150
15 7247538298
16 152150838840
17 3403471995560
18 80589585571040
19 2012376195058384
20 52929114594971184
21 1464737200231998960
22 42545324327111272800
23 1293727732305595341216