# A167564 (b-file synthesized from sequence entry)
1 1
2 3
3 11
4 47
5 241
6 1457
7 10223
8 81835
9 736637
10 7366661
11 81034027
12 972410303
13 12641339465
14 176978768137
15 2654681568551
16 42474905237267
17 722073389475733
18 12997321011978125
19 246949099232271587
20 4938981984661217191