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A331573 as a simple table

na(n)
11
20
31
4-2
55
6-14
739
8-102
9247
10-558
111197
12-2494
135167
14-10850
1523311
16-51132
17113333
18-250694
19547871
20-1175998
212475153
22-5117486
2310439895
24-21142030
2542777735
26-86960284
27178221401
28-368541508
29767762191
30-1606535062
313365499467
32-7038925364
3314671422797
34-30450115592

[1,0,1,-2,5,-14,39,-102,247,-558,1197,-2494,5167,
 -10850,23311,-51132,113333,-250694,547871,
 -1175998,2475153,-5117486,10439895,-21142030,
 42777735,-86960284,178221401,-368541508,767762191,
 -1606535062,3365499467,-7038925364,14671422797,
 -30450115592]