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A009621 as a simple table

na(n)
00
11
20
34
4-12
571
6-420
72962
8-23688
9213229
10-2132280
1123455136
12-281461620
133659001139
14-51226015932
15768390239086
16-12294243825360
17209002145031257
18-3762038610562608
1971478733600689724
20-1429574672013794460

[0,1,0,4,-12,71,-420,2962,-23688,213229,-2132280,
 23455136,-281461620,3659001139,-51226015932,
 768390239086,-12294243825360,209002145031257,
 -3762038610562608,71478733600689724,
 -1429574672013794460]