# A097789 (b-file synthesized from sequence entry)
0 1
1 9
2 51
3 239
4 1026
5 4230
6 17130
7 68850
8 275895
9 1104295
10 4418181
11 17674089
12 70698176
13 282795084
14 1131183396
15 4524737460
16 18098954685
17 72395824725
18 289583306215
19 1158333233715
20 4633332945486
21 18533331794594
22 74133327193326