# A162807 (b-file synthesized from sequence entry)
0 1
1 21
2 420
3 8190
4 159600
5 3108210
6 60532290
7 1178845500
8 22957618110
9 447091673490
10 8706955895400
11 169564956368010
12 3302218915041690
13 64309571936658300
14 1252406684472377910
15 24390187277913766890