# A088166 (b-file synthesized from sequence entry)
2 12
3 72
4 504
5 3410
6 23184
7 159094
8 1089648
9 7465176
10 51170460
11 350713222
12 2403763488
13 16475700746
14 112925875764
15 774004377960
16 5305106018016
17 36361732975514
18 249227005939632
19 1708227330997438
20 11708364225400920