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A012591 as a simple table

na(n)
00
11
22
30
4-24
5-140
6-200
75096
863616
9282192
10-3220832
11-80931136
12-710613376
133394272960
14211897855104
153116854010752
162173449924608
17-951933369204480
18-22125765748465152
19-140624117764880384

[0,1,2,0,-24,-140,-200,5096,63616,282192,-3220832,
 -80931136,-710613376,3394272960,211897855104,
 3116854010752,2173449924608,-951933369204480,
 -22125765748465152,-140624117764880384]