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A012220 as a simple table

na(n)
01
11
2-11
3349
4-22007
52312601
6-365164227
780916522933
8-23968582079343
99151870592718513
10-4378918837383018747
112566828786036427906445
12-1809533477302236292739175
131510703360292377534570508105

[1,1,-11,349,-22007,2312601,-365164227,
 80916522933,-23968582079343,9151870592718513,
 -4378918837383018747,2566828786036427906445,
 -1809533477302236292739175,
 1510703360292377534570508105]