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A156720 as a simple table

na(n)
01
1-5
2-84
32645
437380
5-990125
6-41075244
76100987285
884147366660
9-4018059515075
10-277011341395404
1132334176427828815
121337456651437946340
13-92249828940696374225
14-8903456587278888387564
155668687258864979375891525
1678158704678426515547572420

[1,-5,-84,2645,37380,-990125,-41075244,6100987285,
 84147366660,-4018059515075,-277011341395404,
 32334176427828815,1337456651437946340,
 -92249828940696374225,-8903456587278888387564,
 5668687258864979375891525,
 78158704678426515547572420]