# A034271 (b-file synthesized from sequence entry)
0 0
1 1
2 15
3 125
4 814
5 4641
6 24388
7 121380
8 581400
9 2707386
10 12339569
11 55304535
12 244567050
13 1069784625
14 4637437560
15 19951650840
16 85290143760
17 362608278750
18 1534330716750
19 6465583372794
20 27147098904156
21 113618646478106
22 474177584413720