# A018097 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 9
4 18
5 37
6 76
7 157
8 324
9 667
10 1375
11 2831
12 5832
13 12013
14 24743
15 50965
16 104976
17 216226
18 445375
19 917370
20 1889568
21 3892070
22 8016758
23 16512655
24 34012224
25 70057261
26 144301645
27 297227788
28 612220032