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A305136 as a simple table

na(n)
11
2-1
33
4-6
516
6-46
7142
8-471
91606
10-5616
1119946
12-71659
13260044
14-951532
153507916
16-13018488
1748601126
18-182406035
19687851096
20-2604964819
219903253875
22-37780174088
23144584919872
24-554927186056
252135497844772
26-8237988842334
2731850890373750
28-123403823544802
29479047178570539
30-1863001134095713
317257404420481641
32-28316271490365464
33110645779544592100

[1,-1,3,-6,16,-46,142,-471,1606,-5616,19946,
 -71659,260044,-951532,3507916,-13018488,48601126,
 -182406035,687851096,-2604964819,9903253875,
 -37780174088,144584919872,-554927186056,
 2135497844772,-8237988842334,31850890373750,
 -123403823544802,479047178570539,
 -1863001134095713,7257404420481641,
 -28316271490365464,110645779544592100]