# A018101 (b-file synthesized from sequence entry)
0 1
1 3
2 5
3 10
4 19
5 40
6 83
7 173
8 361
9 754
10 1574
11 3286
12 6859
13 14321
14 29898
15 62421
16 130321
17 272084
18 568057
19 1185987
20 2476099
21 5169594
22 10793066
23 22533737
24 47045881
25 98222279
26 205068241
27 428140988
28 893871739