# A271180 (b-file synthesized from sequence entry)
0 1
1 1
2 5
3 15
4 45
5 125
6 342
7 921
8 2461
9 6535
10 17282
11 45567
12 119898
13 315020
14 826830
15 2168583
16 5684731
17 14896459
18 39024899
19 102216045
20 267693813
21 700997144
22 1835543565
23 4806092673
24 12583591525
25 32946281848
26 86258240735
27 225834015840