# A068718 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 2
4 8
5 25
6 90
7 404
8 2055
9 11792
10 75053
11 525622
12 4015361
13 33231679
14 296182315
15 2828335731
16 28809181418
17 311788442591
18 3572832236720
19 43216177809190
20 550245463265240
21 7356239983352887
22 103028812072639378