A013193 - OEIS

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A013193 as a simple table

n	a(n)
0	0
1	1
2	-1
3	4
4	-15
5	93
6	-633
7	5381
8	-51506
9	565957
10	-6922205
11	93992413
12	-1398890284
13	22689478823
14	-398141898399
15	7519118564551
16	-152056970221072
17	3278894568674073
18	-75103176871966409
19	1821102601528126265

[0,1,-1,4,-15,93,-633,5381,-51506,565957,-6922205, 93992413,-1398890284,22689478823,-398141898399, 7519118564551,-152056970221072,3278894568674073, -75103176871966409,1821102601528126265]