# A007230 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 7
5 12
6 30
7 54
8 127
9 226
10 508
11 930
12 2046
13 3780
14 8182
15 15288
16 32767
17 61680
18 131042
19 248346
20 524284