# A004791 (b-file synthesized from sequence entry)
1 2
2 6
3 7
4 20
5 148
6 403
7 1096
8 2980
9 8101
10 8102
11 8103
12 59874
13 442413
14 1202604
15 3269017
16 8886110
17 24154952
18 65659968
19 65659969
20 485165195
21 1318815734
22 3584912845
23 3584912846
24 9744803446
25 72004899336
26 72004899337
27 195729609428
28 532048240600