# A019119 (b-file synthesized from sequence entry)
3 0
4 1
5 4
6 2
7 6
8 24
9 28
10 70
11 220
12 418
13 1079
14 3229
15 7816
16 20030
17 54017
18 137231
19 351289
20 913028
21 2360630
22 6135502
23 16039333
24 42102137
25 110891643
26 292830804
27 775990286
28 2060703746
29 5481264472
30 14616590748
31 39049205927