# A018075 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 6
4 11
5 20
6 36
7 66
8 121
9 220
10 401
11 730
12 1331
13 2423
14 4414
15 8039
16 14641
17 26663
18 48558
19 88433
20 161051
21 293299
22 534145
23 972765
24 1771561
25 3226296
26 5875603
27 10700415
28 19487171
29 35489261
30 64631634
31 117704565