A009275 - OEIS

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A009275 as a simple table

n	a(n)
0	1
1	1
2	1
3	-4
4	-19
5	12
6	517
7	1472
8	-18023
9	-159792
10	587529
11	16362304
12	19183749
13	-1834702400
14	-12219870323
15	218477736448
16	3379214470193
17	-23399883425536
18	-883981857320943
19	225490426670080
20	238930492488456221

[1,1,1,-4,-19,12,517,1472,-18023,-159792,587529, 16362304,19183749,-1834702400,-12219870323, 218477736448,3379214470193,-23399883425536, -883981857320943,225490426670080, 238930492488456221]