A015019 - OEIS

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A015019 as a simple table

n	a(n)
1	1
2	-5
3	-155
4	28675
5	31857925
6	-212333070125
7	-8491411807368875
8	2037471806119124711875
9	2933289072587326393069793125
10	-25337824341236140066496699758578125
11	-1313212585969062194023540996089250607796875

[1,-5,-155,28675,31857925,-212333070125, -8491411807368875,2037471806119124711875, 2933289072587326393069793125, -25337824341236140066496699758578125, -1313212585969062194023540996089250607796875]