# A072171 (b-file synthesized from sequence entry)
-1 2
0 6
1 14
2 71
3 190
4 610
5 1929
6 5946
7 17765
8 51094
9 140062
10 409194
11 1196690
12 3481113
13 10126390
14 29457184
15 85689537
16 249266759
17 725105060
18 2109295881
19 6135840666
20 17848866544