# A148470 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 19
5 67
6 256
7 1009
8 4142
9 17414
10 74809
11 326561
12 1445537
13 6471269
14 29249189
15 133290846
16 611705691
17 2824538309
18 13112342280
19 61160095004
20 286468978496
21 1346833508320
22 6353439356603
23 30062083022069
24 142632952280387
25 678427094673463
26 3234255626165415
27 15450773667197851
28 73953278033658544