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A009774 as a simple table

na(n)
00
11
2-1
3-2
414
5-14
6-286
71828
83464
9-130664
10619304
117421008
12-128214736
13153779536
1418052524944
15-209102239712
16-1370716606336
1763200892286336
18-414519986847616
19-12766540334296832
20303340786629265664

[0,1,-1,-2,14,-14,-286,1828,3464,-130664,619304,
 7421008,-128214736,153779536,18052524944,
 -209102239712,-1370716606336,63200892286336,
 -414519986847616,-12766540334296832,
 303340786629265664]