# A149866 (b-file synthesized from sequence entry)
0 1
1 2
2 5
3 13
4 40
5 134
6 467
7 1671
8 6172
9 23436
10 90370
11 354271
12 1410448
13 5681881
14 23111260
15 94915721
16 393246863
17 1640456796
18 6888518741
19 29110220069
20 123682094892
21 528032933464
22 2264948231740
23 9757427695261
24 42194050729094
25 183120618953859
26 797497306584136
27 3483922404178219
28 15263691795321215