# A027334 (b-file synthesized from sequence entry)
0 1
1 3
2 18
3 54
4 162
5 486
6 1458
7 4374
8 13122
9 39366
10 118098
11 354294
12 1062882
13 3188646
14 9565938
15 28697814
16 86093442
17 258280326
18 774840978
19 2324522934
20 6973568802
21 20920706406
22 62762119218
23 188286357654
24 564859072962