# A018081 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 6
4 13
5 24
6 46
7 89
8 169
9 320
10 609
11 1157
12 2197
13 4171
14 7921
15 15041
16 28561
17 54232
18 102978
19 195537
20 371293
21 705021
22 1338715
23 2541992
24 4826809
25 9165284
26 17403307
27 33045903
28 62748517
29 119148698
30 226242995