# A380497 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 46
4 314
5 3072
6 37641
7 603510
8 11148030
9 249327430
10 7040987792
11 216220333314
12 7895699690498
13 321315600822232
14 13770543972819903
15 644232544408157820
16 33954066516677635554
17 1994206929690480710244
18 121461036181617491970561
19 8111955386813996410196454
20 574814471423312085719652432