# A103334 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 24
4 176
5 1376
6 10944
7 87424
8 699136
9 5592576
10 44739584
11 357914624
12 2863312896
13 22906494976
14 183251943424
15 1466015514624
16 11728124051456
17 93824992280576
18 750599937982464
19 6004799503335424
20 48038396025634816