# A215680 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 3
4 0
5 30
6 90
7 588
8 5040
9 26520
10 325080
11 2158728
12 27731880
13 249259920
14 3181258080
15 36821629848
16 482278043520
17 6704476956480
18 93675256079040
19 1479108131816448
20 22566722722104960
21 390679249452835200
22 6559255213047250560
23 122197022127873558528