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A126966 as a simple table

na(n)
01
10
2-2
3-8
4-26
5-80
6-244
7-752
8-2362
9-7584
10-24892
11-83376
12-284324
13-984672
14-3455144
15-12259168
16-43908026
17-158531392
18-576352364
19-2107982128
20-7750490636
21-28629222112
22-106190978264
23-395347083808
24-1476813394916
25-5533435084480
26-20790762971864
27-78316232088032

[1,0,-2,-8,-26,-80,-244,-752,-2362,-7584,-24892,
 -83376,-284324,-984672,-3455144,-12259168,
 -43908026,-158531392,-576352364,-2107982128,
 -7750490636,-28629222112,-106190978264,
 -395347083808,-1476813394916,-5533435084480,
 -20790762971864,-78316232088032]