A154243 - OEIS

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A154243 as a simple table

n	a(n)
0	2
1	-1
2	1
3	-1
4	-1
5	1
6	23
7	-23
8	157
9	97051
10	-1614583
11	-331691
12	1418383997
13	-5720927
14	-1868325937
15	1207461869239
16	118209298450003
17	-3069893653
18	-14303719087308533
19	65108016166881997
20	-310766859240153209819

[2,-1,1,-1,-1,1,23,-23,157,97051,-1614583,-331691, 1418383997,-5720927,-1868325937,1207461869239, 118209298450003,-3069893653,-14303719087308533, 65108016166881997,-310766859240153209819]