A013540 - OEIS

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A013540 as a simple table

n	a(n)
0	-1
1	7
2	-17
3	913
4	-93959
5	9405719
6	-8909477
7	211410621413
8	-6740064210937
9	2805742760628347
10	-761503407533329723
11	340317674208644677253
12	-38791272133810800467
13	1468818906393936912860264741

[-1,7,-17,913,-93959,9405719,-8909477, 211410621413,-6740064210937,2805742760628347, -761503407533329723,340317674208644677253, -38791272133810800467, 1468818906393936912860264741]