# A073720 (b-file synthesized from sequence entry)
1 1
2 11
3 58
4 293
5 1468
6 7343
7 36718
8 183593
9 917968
10 4589843
11 22949218
12 114746093
13 573730468
14 2868652343
15 14343261718
16 71716308593
17 358581542968
18 1792907714843
19 8964538574218
20 44822692871093
21 224113464355468