A013069 - OEIS

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A013069 as a simple table

n	a(n)
0	1
1	2
2	3
3	3
4	-3
5	-15
6	45
7	315
8	-1575
9	-14175
10	99225
11	1091475
12	-9823275
13	-127702575
14	1404728325
15	21070924875
16	-273922023375
17	-4656674397375
18	69850115960625
19	1327152203251875
20	-22561587455281875

[1,2,3,3,-3,-15,45,315,-1575,-14175,99225,1091475, -9823275,-127702575,1404728325,21070924875, -273922023375,-4656674397375,69850115960625, 1327152203251875,-22561587455281875]