# A026153 (b-file synthesized from sequence entry)
2 1
3 2
4 7
5 20
6 60
7 176
8 517
9 1512
10 4415
11 12870
12 37477
13 109044
14 317109
15 921870
16 2679510
17 7787904
18 22636503
19 65804638
20 191332945
21 556456060
22 1618813834
23 4710869108
24 13713658368
25 39935698400
26 116340344575
27 339050396646
28 988474306017