# A005566 (b-file synthesized from sequence entry)
0 1
1 2
2 6
3 18
4 60
5 200
6 700
7 2450
8 8820
9 31752
10 116424
11 426888
12 1585584
13 5889312
14 22084920
15 82818450
16 312869700
17 1181952200
18 4491418360
19 17067389768
20 65166397296
21 248817153312
22 953799087696
23 3656229836168
24 14062422446800
25 54086240180000
26 208618354980000