# A227946 (b-file synthesized from sequence entry)
0 1
1 2
2 7
3 19
4 47
5 163
6 487
7 1307
8 2879
9 19683
10 39367
11 177147
12 531441
13 1594323
14 4782969
15 14348907
16 43046721
17 86093443
18 258280327
19 688747547
20 3486784401
21 10460353203