# A357721 (b-file synthesized from sequence entry)
0 1
1 0
2 -2
3 9
4 -28
5 0
6 1200
7 -16464
8 167904
9 -1393200
10 7429240
11 43124400
12 -2404571904
13 55590286752
14 -1027511503200
15 16489054310400
16 -222885864448000
17 1994839594780032
18 14489184835474272
19 -1470395490046560000
20 54581408106475622400
21 -1608207353670788640000