# A000697 (b-file synthesized from sequence entry)
0 1
1 2
2 7
3 26
4 89
5 316
6 1243
7 5564
8 28321
9 162160
10 1032051
11 7226636
12 55206161
13 456886912
14 4072080587
15 38885496092
16 396084390849
17 4286637591872
18 49121248360291
19 594159600856332
20 7565074996215025
21 101137602761945440