# A148489 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 21
5 73
6 272
7 1055
8 4226
9 17296
10 72002
11 304223
12 1302487
13 5631257
14 24557910
15 107912037
16 477269006
17 2122877159
18 9489677428
19 42608326043
20 192070741414
21 868890650080
22 3943246247910
23 17947364156580
24 81901112293463
25 374647230094154
26 1717560685555588
27 7890073413521769
28 36312976830040510