# A109155 (b-file synthesized from sequence entry)
0 1
1 3
2 6
3 24
4 102
5 516
6 2814
7 16752
8 106026
9 712260
10 5027190
11 37158600
12 286141638
13 2289018708
14 18961164774
15 162271001760
16 1431533922642
17 12994777356228
18 121174578691398
19 1159065402957240
20 11357543381281638
21 113876839666712676