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A079895 as a simple table

na(n)
11
20
32
4-2
58
6-30
766
8-392
91574
10-9440
1137770
12-377696
131510796
14-18129546
15108777284
16-870218264
176961746128
18-111387938042
19668327628270
20-12029897308852
2196239178470828
22-1154870141649926
2311548701416499282
24-254071431162984196
252032571449303873588

[1,0,2,-2,8,-30,66,-392,1574,-9440,37770,-377696,
 1510796,-18129546,108777284,-870218264,6961746128,
 -111387938042,668327628270,-12029897308852,
 96239178470828,-1154870141649926,
 11548701416499282,-254071431162984196,
 2032571449303873588]