# A007231 (b-file synthesized from sequence entry)
1 1
2 5
3 13
4 52
5 121
6 455
7 1093
8 4305
9 9841
10 36905
11 88573
12 348728
13 797161
14 2989355
15 7174453
16 28585712
17 64570081
18 242137805
19 581130733
20 2288202262