A012787 - OEIS

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A012787 as a simple table

n	a(n)
0	1
1	-1
2	-15
3	-345
4	-11263
5	-455025
6	-16466703
7	746021367
8	480286325633
9	150637957014303
10	46203820378253425
11	15313454320801213511
12	5643895146092962507905
13	2333857400234709586763695

[1,-1,-15,-345,-11263,-455025,-16466703,746021367, 480286325633,150637957014303,46203820378253425, 15313454320801213511,5643895146092962507905, 2333857400234709586763695]

[1,-1,-15,-345,-11263,-455025,-16466703,746021367,
 480286325633,150637957014303,46203820378253425,
 15313454320801213511,5643895146092962507905,
 2333857400234709586763695]