# A026889 (b-file synthesized from sequence entry)
2 1
3 7
4 37
5 178
6 825
7 3774
8 17250
9 79326
10 368516
11 1733597
12 8268603
13 40003178
14 196273837
15 976066486
16 4915503146
17 25042730042
18 128927697340
19 670023585820
20 3511276691660
21 18537816521102
22 98514404946264
23 526575421631986