# A243280 (b-file synthesized from sequence entry)
0 1
1 3
2 13
3 63
4 325
5 1748
6 9685
7 54841
8 315605
9 1838610
10 10811788
11 64041706
12 381525253
13 2283436938
14 13718099275
15 82672421423
16 499546587317
17 3025336228390
18 18357852413062
19 111587292429820
20 679306584310220