# A189878 (b-file synthesized from sequence entry)
1 1
2 0
3 0
4 2
5 10
6 4
7 28
8 20
9 56
10 72
11 200
12 644
13 2940
14 9152
15 39200
16 166100
17 739924
18 3586840
19 18640500
20 107580592
21 547737844
22 3080550788