# A018173 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 7
4 11
5 20
6 37
7 67
8 121
9 220
10 400
11 729
12 1326
13 2414
14 4395
15 8000
16 14565
17 26516
18 48274
19 87885
20 160000
21 291291
22 530313
23 965469
24 1757697
25 3200000
26 5825806
27 10606253
28 19309365
29 35153938
30 64000000
31 116516109