# A061693 (b-file synthesized from sequence entry)
1 0
2 4
3 27
4 172
5 1125
6 7591
7 52479
8 369580
9 2640465
10 19082629
11 139207959
12 1023462199
13 7574172879
14 56369211679
15 421563478527
16 3166149812140
17 23868662788809
18 180538738842217
19 1369635435497367
20 10418413517675797