# A006299 (b-file synthesized from sequence entry)
4 21
5 483
6 15018
7 258972
8 5554188
9 85421118
10 1558792200
11 22555934280
12 375708427812
13 5235847653036
14 82234427131416
15 1117259292848016
16 16842445235560944
17 224686278407291148
18 3286157560248860532
19 43241609165618454096
20 617910462111714896820