# A197082 (b-file synthesized from sequence entry)
1 2
2 9
3 75
4 625
5 5145
6 42875
7 352947
8 2941225
9 28824005
10 282475249
11 4882786447
12 60287465315
13 744365643175
14 10212696624361
15 118890080527911
16 1387050939492295
17 17125833028425275
18 211451611881577375
19 2584630720649942503
20 30088718564300934153
21 351035049916844231785