# A018168 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 5
4 10
5 19
6 34
7 61
8 111
9 200
10 361
11 650
12 1172
13 2112
14 3806
15 6859
16 12359
17 22272
18 40134
19 72320
20 130321
21 234836
22 423170
23 762546
24 1374096
25 2476099
26 4461888
27 8040248
28 14488391
29 26107836
30 47045881
31 84775883