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A216801 as a simple table

na(n)
12
2-22
3-117
4-468
5-1755
6-6513
7-24336
8-91988
9-351689
10-1357408
11-5277363
12-20625774
13-80909257
14-318173258
15-1253243498
16-4941450657
17-19495914360
18-76945654032
19-303737001009
20-1199041027587
21-4733273752831
22-18683644465447
23-73743457866962

[2,-22,-117,-468,-1755,-6513,-24336,-91988,
 -351689,-1357408,-5277363,-20625774,-80909257,
 -318173258,-1253243498,-4941450657,-19495914360,
 -76945654032,-303737001009,-1199041027587,
 -4733273752831,-18683644465447,-73743457866962]