# A165214 (b-file synthesized from sequence entry)
0 1
1 7
2 42
3 252
4 1512
5 9072
6 54432
7 326592
8 1959552
9 11757291
10 70543620
11 423260985
12 2539561500
13 15237342540
14 91423896480
15 548542426320
16 3291248842560
17 19747458763200
18 118484546826660
19 710906046446925
20 4265428871616150