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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A199580 as a triangular array

0
21
-301
8-4-41
-303015-101
144-216-4884-181
-84016800-700245-281
5760-1440028806000-3120552-401
-45360136080-52920-5292039690-97021071-541
403200-1411200806400470400

A199580 as a square array

02-38-30144-8405760-45360403200
10-430-2161680-14400136080-1411200
1-415-4802880-52920806400
1-1084-7006000-52920470400
1-18245-312039690
1-28552-9702
1-401071
1-54
1
02-38-30144-8405760-45360403200
10-430-2161680-14400136080-1411200
1-415-4802880-52920806400
1-1084-7006000-52920470400
1-18245-312039690
1-28552-9702
1-401071
1-54
1