# A027986 (b-file synthesized from sequence entry)
2 20
3 100
4 420
5 1694
6 6746
7 26735
8 105722
9 417613
10 1648692
11 6507197
12 25681362
13 101359219
14 400094756
15 1579568360
16 6237401648
17 24635828774
18 97327071806
19 384596629610
20 1520138671688
21 6009885957464
22 23765835521966
23 94003008751940