# A052745 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 6
4 24
5 110
6 600
7 3836
8 28224
9 235224
10 2191680
11 22584672
12 255087360
13 3134139840
14 41620400640
15 594082771200
16 9070900715520
17 147531542054400
18 2546434166169600
19 46489412442009600
20 895079522340864000
21 18125736166340812800
22 385129713617510400000