# A005980 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 4
4 9
5 16
6 35
7 63
8 129
9 234
10 445
11 798
12 1458
13 2568
14 4561
15 7924
16 13770
17 23584
18 40301
19 68097
20 114646
21 191336
22 317893
23 524396
24 861054
25 1405130
26 2282651
27 3688254
28 5933463