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A012488 as a simple table

na(n)
01
1-4
260
3-2056
4127376
5-11253504
61524986944
7-257629834112
860842617280768
9-16737691854400512
106112605714322803712
11-2481449664133693548544
121299422306103439813611520

[1,-4,60,-2056,127376,-11253504,1524986944,
 -257629834112,60842617280768,-16737691854400512,
 6112605714322803712,-2481449664133693548544,
 1299422306103439813611520]