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A143818 as a simple table

na(n)
10
21
30
4-2
5-5
6-5
720
8149
9552
10991
11-3799
12-49841
13-299937
14-1127358
15-587744
1634873758
17380671819
182584563448
1911105613358
20-2623056379
21-659822835085
22-8393151852216
23-69959106516419
24-390297675629170
25-414406919999723

[0,1,0,-2,-5,-5,20,149,552,991,-3799,-49841,
 -299937,-1127358,-587744,34873758,380671819,
 2584563448,11105613358,-2623056379,-659822835085,
 -8393151852216,-69959106516419,-390297675629170,
 -414406919999723]