# A037648 (b-file synthesized from sequence entry)
1 3
2 18
3 109
4 657
5 3942
6 23653
7 141921
8 851526
9 5109157
10 30654945
11 183929670
12 1103578021
13 6621468129
14 39728808774
15 238372852645
16 1430237115873
17 8581422695238
18 51488536171429
19 308931217028577
20 1853587302171462