# A294198 (b-file synthesized from sequence entry)
1 0
2 0
3 3
4 12
5 120
6 1200
7 16380
8 255696
9 4726008
10 99107280
11 2346042600
12 61706210280
13 1788467429892
14 56618211155688
15 1944581982268380
16 72019509651227040
17 2861473883255362800
18 121414006972684901664
19 5479661140682410928592
20 262122044885503316203320