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A361711 as a simple table

na(n)
11
21
3-8
45
5126
6-168
7-2400
84125
950050
10-98098
11-1100736
122339064
1325069968
14-56279520
15-585307008
161367240589
1713919870250
18-33510798750
19-335813478000
20827780223270
218194328596740
22-20587404077760
23-201822515032320
24515067876905400
255009403008531376
26-12953308371172848

[1,1,-8,5,126,-168,-2400,4125,50050,-98098,
 -1100736,2339064,25069968,-56279520,-585307008,
 1367240589,13919870250,-33510798750,-335813478000,
 827780223270,8194328596740,-20587404077760,
 -201822515032320,515067876905400,5009403008531376,
 -12953308371172848]