# A047149 (b-file synthesized from sequence entry)
0 1
1 3
2 13
3 68
4 395
5 2383
6 14628
7 91002
8 572629
9 3635105
10 23230955
11 149252778
12 963125552
13 6238012172
14 40529533578
15 264038158806
16 1724159758595
17 11281813669783
18 73955009216581
19 485575827838870
20 3192818972511443