# A189880 (b-file synthesized from sequence entry)
1 1
2 0
3 0
4 2
5 10
6 0
7 8
8 24
9 72
10 116
11 336
12 1124
13 4056
14 12628
15 58984
16 263066
17 1124116
18 5388972
19 29219680
20 173696136
21 967249940