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A009644 as a simple table

na(n)
00
11
21
34
4-4
555
6-349
73176
8-31536
9356981
10-4486515
1162124676
12-939083124
1315387231899
14-271629760609
155139109612040
16-103734448063424
172225145262126601
18-50544116286741191
191212003840479789476

[0,1,1,4,-4,55,-349,3176,-31536,356981,-4486515,
 62124676,-939083124,15387231899,-271629760609,
 5139109612040,-103734448063424,2225145262126601,
 -50544116286741191,1212003840479789476]