# A018108 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 10
4 22
5 47
6 103
7 223
8 484
9 1048
10 2270
11 4916
12 10648
13 23060
14 49943
15 108164
16 234256
17 507336
18 1098758
19 2379620
20 5153632
21 11161410
22 24172676
23 52351654
24 113379904
25 245551027
26 531798888
27 1151736407