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A370739 as a simple table

na(n)
01
115
2-75
335250
4-1138125
572645000
6-3307996875
7244578890625
8-15502648125000
9985908809765625
10-63515254624218750
114314500023927734375
12-291905297026816406250
1319789483493484814453125
14-1355414138248614990234375
1593666904586649390380859375
16-6498800175020013123779296875

[1,15,-75,35250,-1138125,72645000,-3307996875,
 244578890625,-15502648125000,985908809765625,
 -63515254624218750,4314500023927734375,
 -291905297026816406250,19789483493484814453125,
 -1355414138248614990234375,
 93666904586649390380859375,
 -6498800175020013123779296875]