# A052708 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 2
4 5
5 16
6 56
7 204
8 768
9 2970
10 11726
11 47060
12 191412
13 787304
14 3269100
15 13684864
16 57691353
17 244713654
18 1043684478
19 4472828400
20 19252045120