# A006682 (b-file synthesized from sequence entry)
2 1
3 4
4 20
5 155
6 1716
7 24654
8 434155
9 9043990
10 217457456
11 5926620029
12 180538177590
13 6078622845750
14 224156328707221
15 8984765008810504
16 388939866084222200
17 18083736252080051435
18 898779656769444326136
19 47551736771345760732954