# A052878 (b-file synthesized from sequence entry)
0 0
1 2
2 6
3 34
4 276
5 2928
6 38520
7 606240
8 11118240
9 232928640
10 5488922880
11 143707737600
12 4138613740800
13 130021152307200
14 4425207423436800
15 162194949242726400
16 6369480464675328000
17 266808295408951296000
18 11874724735152254976000
19 559591803705456377856000