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A012203 as a simple table

na(n)
01
11
21
3-3
4-15
549
6609
7-1859
8-48031
9119617
106247681
11-10283171
12-1214813487
13678311217
14330587407201
15246695568861
16-120086685689663
17-270153706006015
1856186566871496961
19221300400903581245

[1,1,1,-3,-15,49,609,-1859,-48031,119617,6247681,
 -10283171,-1214813487,678311217,330587407201,
 246695568861,-120086685689663,-270153706006015,
 56186566871496961,221300400903581245]