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A009237 as a simple table

na(n)
01
11
20
32
4-4
526
6-134
7930
8-6728
953056
10-413744
112752936
12-3042040
13-488089848
1416658828096
15-442856699584
1611075864697536
17-274957302952960
186922538197811392
19-178529204224920384
204739350807332125056

[1,1,0,2,-4,26,-134,930,-6728,53056,-413744,
 2752936,-3042040,-488089848,16658828096,
 -442856699584,11075864697536,-274957302952960,
 6922538197811392,-178529204224920384,
 4739350807332125056]