A013568 - OEIS

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A013568 as a simple table

n	a(n)
0	1
1	0
2	0
3	0
4	7
5	-665
6	219
7	-598
8	11570
9	-5357968
10	995254
11	-4960662
12	126624718
13	-783821598
14	22344623929
15	-166137700653
16	5222279193717
17	-16426560893778654
18	1561364880901471
19	-15643758252397591

[1,0,0,0,7,-665,219,-598,11570,-5357968,995254, -4960662,126624718,-783821598,22344623929, -166137700653,5222279193717,-16426560893778654, 1561364880901471,-15643758252397591]