# A074631 (b-file synthesized from sequence entry)
1 9
2 44
3 168
4 587
5 1940
6 6192
7 19285
8 59010
9 178122
10 531923
11 1574706
12 4628338
13 13521477
14 39299115
15 113712434
16 327752962
17 941457955
18 2696114317
19 7700146599
20 21938239766