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A121626 as a simple table

na(n)
01
11
2-3
3-26
4161
52876
6-27755
7-740536
89722113
9343603216
10-5707904499
11-250756091552
125039646554593
13264489160965056
14-6237995487261915
15-380574552503498624
1610303367499652761601
17716309568462681538816
18-21891769059478538933603

[1,1,-3,-26,161,2876,-27755,-740536,9722113,
 343603216,-5707904499,-250756091552,5039646554593,
 264489160965056,-6237995487261915,
 -380574552503498624,10303367499652761601,
 716309568462681538816,-21891769059478538933603]