# A246509 (b-file synthesized from sequence entry)
0 1
1 4
2 26
3 200
4 1694
5 15224
6 141972
7 1359120
8 13264246
9 131384536
10 1316769196
11 13323636208
12 135885868780
13 1395157192624
14 14406117404584
15 149489132177440
16 1557898906160806
17 16297193704008856
18 171058624529373116
19 1800860588158214960
20 19010179617892702404
21 201164103801453466896