# A005632 (b-file synthesized from sequence entry)
1 0
2 0
3 5
4 22
5 258
6 1628
7 18052
8 145976
9 1837272
10 18407664
11 265312848
12 3184567136
13 52020223648
14 728304073664
15 13317701313600
16 213083801827200
17 4314950946864000
18 77669134543011584
19 1725980887361498368
20 34519618313219995136
21 835374767116711506432
22 18378244896208168541184