# A007239 (b-file synthesized from sequence entry)
1 3
2 6
3 12
4 24
5 54
6 138
7 378
8 1080
9 3186
10 9642
11 29784
12 93552
13 297966
14 960294
15 3126408
16 10268688
17 33989388
18 113277582
19 379833906
20 1280618784
21 4339003044
22 14767407522
23 50464951224
24 173099580168
25 595786322292
26 2057106617226
27 7123467773790
28 24734460619704