# A244522 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 0
4 0
5 2
6 4
7 10
8 36
9 126
10 454
11 1744
12 6892
13 28486
14 120962
15 531660
16 2398248
17 11127674
18 52888998
19 257570104
20 1282439216