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A027436 as a simple table

na(n)
00
11
22
3-4
416
5-80
6432
7-2304
810944
9-35328
10-74112
112736384
12-30853632
13238663680
14-1247457280
152201247744
1632530722816
17-320650199040
18156266184704
1918314630348800
20-20667999748096
21-3428200020508672

[0,1,2,-4,16,-80,432,-2304,10944,-35328,-74112,
 2736384,-30853632,238663680,-1247457280,
 2201247744,32530722816,-320650199040,156266184704,
 18314630348800,-20667999748096,-3428200020508672]