A213140 - OEIS

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A213140 as a simple table

n	a(n)
0	1
1	-3
2	-15
3	69
4	2505
5	10077
6	-716415
7	-14740491
8	213018105
9	15676762317
10	98170027185
11	-17112616737051
12	-553855541534295
13	15477991707447357
14	1557738998240770785
15	10238839745149426389
16	-3849999044450765494695

[1,-3,-15,69,2505,10077,-716415,-14740491, 213018105,15676762317,98170027185,-17112616737051, -553855541534295,15477991707447357, 1557738998240770785,10238839745149426389, -3849999044450765494695]