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A078801 as a simple table

na(n)
01
12
22
3-4
410
5-28
676
7-184
8378
9-620
10708
11-328
12-36
13-4008
1425960
15-83984
16135066
17188788
18-2232236
199070040
20-23335660
2129933128
2269732568
23-630906096
242551027132
25-7193660232
2613576199192
27-5110303664
28-92186317112

[1,2,2,-4,10,-28,76,-184,378,-620,708,-328,-36,
 -4008,25960,-83984,135066,188788,-2232236,9070040,
 -23335660,29933128,69732568,-630906096,2551027132,
 -7193660232,13576199192,-5110303664,-92186317112]