# A162941 (b-file synthesized from sequence entry)
0 1
1 7
2 42
3 252
4 1491
5 8820
6 52185
7 308700
8 1826160
9 10802925
10 63906150
11 378045675
12 2236381350
13 13229622000
14 78261652875
15 462967596000
16 2738748634125
17 16201445085000
18 95841881782500
19 566965863568125
20 3353964722666250