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A176618 as a simple table

na(n)
00
11
2-2
319
4-14
5199
6-137
7851
8-548
94121
10-2533
1167451
12-40078
13404869
14-234967
151655047
16-940136
1732428087
18-18383711
19439693871
20-235204778
21-724823111
22352226881
23260572074487
24-130542594044
25-6002444699183
263000757572779

[0,1,-2,19,-14,199,-137,851,-548,4121,-2533,67451,
 -40078,404869,-234967,1655047,-940136,32428087,
 -18383711,439693871,-235204778,-724823111,
 352226881,260572074487,-130542594044,
 -6002444699183,3000757572779]