# A009239 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 4
4 13
5 68
6 373
7 2528
8 19097
9 160400
10 1522409
11 15384128
12 174263717
13 2066458176
14 27072485469
15 369136141824
16 5477315064625
17 84457146691840
18 1398343023229393
19 24053254928131072
20 439386703590146365