# A181688 (b-file synthesized from sequence entry)
1 1
2 1
3 4
4 8
5 23
6 55
7 144
8 360
9 921
10 2329
11 5924
12 15024
13 38159
14 96847
15 245888
16 624176
17 1584593
18 4022609
19 10211940
20 25924088
21 65811431
22 167069767
23 424126160
24 1076693080
25 2733310377
26 6938824361
27 17615009476
28 44717740000
29 113521160607
30 288186606623