# A076625 (b-file synthesized from sequence entry)
1 2
2 8
3 40
4 208
5 1200
6 6528
7 34048
8 196608
9 1112064
10 6062080
11 33701888
12 194871296
13 1091371008
14 5950930944
15 34801188864
16 198474465280
17 1105056497664
18 6298980581376
19 36394596564992
20 205774030635008
21 1151529050439680