# A177175 (b-file synthesized from sequence entry)
0 1
1 6
2 13
3 64
4 287
5 1515
6 8143
7 46030
8 265909
9 1572193
10 9443997
11 57529101
12 354394057
13 2204333079
14 13823770729
15 87311462772
16 554904606279
17 3546103422655
18 22772157825695
19 146876986425311
20 951065019090195