# A209290 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 24
4 324
5 5120
6 93750
7 1959552
8 46118408
9 1207959552
10 34867844010
11 1100000000000
12 37661140520652
13 1390911669927936
14 55123269399790046
15 2333521433367183360
16 105094533691406250000
17 5017514388048998039552
18 253135520137219049838162
19 13456471561751415850795008