# A051685 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 -6
5 -30
6 0
7 420
8 2100
9 6804
10 -20160
11 -376200
12 -2102760
13 -6606600
14 53237184
15 965306160
16 5941244400
17 12774059760
18 -305998041600
19 -5264368533216
20 -33983490935520
21 -16008359119200
22 3139364813249280
23 52132631033313600
24 341037535726730304
25 -715693892444414400