# A013430 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 -1
4 0
5 -15
6 10
7 -495
8 840
9 -29575
10 87750
11 -2805075
12 12340900
13 -387547875
14 2304422250
15 -73485787375
16 556725078000
17 -18311017515375
18 169707184396750
19 -5801182757296875
20 63859173696337500