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A004407 as a simple table

na(n)
01
1-12
284
3-448
42004
5-7896
628224
7-93312
8289236
9-848972
102377704
11-6391872
1216571968
13-41599320
14101430144
15-240877440
16558440916
17-1266406680
182814053908
19-6136337088
2013148606184
21-27717527552

[1,-12,84,-448,2004,-7896,28224,-93312,289236,
 -848972,2377704,-6391872,16571968,-41599320,
 101430144,-240877440,558440916,-1266406680,
 2814053908,-6136337088,13148606184,-27717527552]