# A074000 (b-file synthesized from sequence entry)
1 1
2 1
3 3
4 9
5 21
6 99
7 225
8 729
9 2187
10 6561
11 19845
12 58563
13 177633
14 531441
15 1594323
16 4782969
17 14344533
18 43059843
19 129127041
20 387420489
21 1162261467