A013548 - OEIS

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A013548 as a simple table

n	a(n)
0	1
1	-1
2	221
3	-244939
4	1846213
5	-526960582373
6	23968139993843
7	-5189795464140757
8	36594801159269740631
9	-16691319229288614334663751
10	11409300606349966887237659743
11	-198510162914463324156683262269

[1,-1,221,-244939,1846213,-526960582373, 23968139993843,-5189795464140757, 36594801159269740631,-16691319229288614334663751, 11409300606349966887237659743, -198510162914463324156683262269]