# A003290 (b-file synthesized from sequence entry)
2 1
3 6
4 18
5 50
6 156
7 508
8 1724
9 6018
10 21440
11 77632
12 284706
13 1055162
14 3944956
15 14858934
16 56325420
17 214698578
18 822373244
19 3163606784
20 12217121138
21 47343356398
22 184038696776
23 717456797490
24 2804219712064
25 10986639618642