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A266708 as a simple table

na(n)
00
1-10
2-18
3-56
4-138
5-370
6-960
7-2522
8-6594
9-17272
10-45210
11-118370
12-309888
13-811306
14-2124018
15-5560760
16-14558250
17-38114002
18-99783744
19-261237242
20-683927970
21-1790546680
22-4687712058
23-12272589506
24-32130056448
25-84117579850
26-220222683090

[0,-10,-18,-56,-138,-370,-960,-2522,-6594,-17272,
 -45210,-118370,-309888,-811306,-2124018,-5560760,
 -14558250,-38114002,-99783744,-261237242,
 -683927970,-1790546680,-4687712058,-12272589506,
 -32130056448,-84117579850,-220222683090]