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A290958 as a simple table

na(n)
11
2-2
36
4-26
5100
6-460
72258
8-11558
960786
10-326826
111785930
12-9893778
1355447800
14-313817720
151791442406
16-10303155322
1759642852324
18-347233450156
192031756438046
20-11941773701426
2170471288256196
22-417379686511812
232480161711278070
24-14781955283569090
2588343937381017274
26-529319474378769346
273178848917169132254
28-19131855254581689246

[1,-2,6,-26,100,-460,2258,-11558,60786,-326826,
 1785930,-9893778,55447800,-313817720,1791442406,
 -10303155322,59642852324,-347233450156,
 2031756438046,-11941773701426,70471288256196,
 -417379686511812,2480161711278070,
 -14781955283569090,88343937381017274,
 -529319474378769346,3178848917169132254,
 -19131855254581689246]