# A177371 (b-file synthesized from sequence entry)
0 1
1 18
2 98
3 812
4 5748
5 43120
6 316600
7 2343120
8 17290256
9 127726400
10 943159584
11 6965532736
12 51439836352
13 379886330112
14 2805462584192
15 20718413985536
16 153005867110656
17 1129951564794880
18 8344715027364352
19 61625891492889600