# A173184 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 4
4 13
5 57
6 322
7 2176
8 17009
9 150505
10 1485466
11 16170036
12 192384877
13 2483177809
14 34554278858
15 515620794592
16 8212685046337
17 139062777326001
18 2494364438359954
19 47245095998005060
20 942259727190907181
21 19737566982241851721
22 433234326593362631602