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A005798 as a simple table

na(n)
00
11
2-8
344
4-192
5718
6-2400
77352
8-20992
956549
10-145008
11356388
12-844032
131934534
14-4306368
159337704
16-19771392
1740965362
18-83207976
19165944732
20-325393024
21628092832
22-1194744096
232241688744
24-4152367104
257599231223
26-13749863984

[0,1,-8,44,-192,718,-2400,7352,-20992,56549,
 -145008,356388,-844032,1934534,-4306368,9337704,
 -19771392,40965362,-83207976,165944732,-325393024,
 628092832,-1194744096,2241688744,-4152367104,
 7599231223,-13749863984]