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A289086 as a simple table

na(n)
01
10
20
3-4
4-16
5-44
6-104
7316
87456
967620
10458280
111945036
12-8476496
13-329703244
14-4937610184
15-52376610724
16-339229127104
171480668009540
1898702565516360
192094684947562476
2030513682733622224
21275602192570387156
22-985849997324785064
23-115940732145525976964

[1,0,0,-4,-16,-44,-104,316,7456,67620,458280,
 1945036,-8476496,-329703244,-4937610184,
 -52376610724,-339229127104,1480668009540,
 98702565516360,2094684947562476,30513682733622224,
 275602192570387156,-985849997324785064,
 -115940732145525976964]