# A373684 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 7
4 49
5 181
6 1201
7 16171
8 122977
9 971209
10 16788961
11 206578351
12 2094314641
13 40260673597
14 694617709969
15 9088535091091
16 187060085419201
17 4109646055718161
18 68029103349383617
19 1498126927153125079
20 39199612737165358321
21 799248202624341298501