A123233 - OEIS

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A123233 as a simple table

n	a(n)
0	1
1	0
2	5
3	-4
4	-39
5	-24
6	1823
7	-6566
8	-1844
9	-34087
10	84846
11	-449836
12	-1117632
13	-3465179
14	-1766196
15	-11290074
16	105510354
17	-208774399
18	704933861

[1,0,5,-4,-39,-24,1823,-6566,-1844,-34087,84846, -449836,-1117632,-3465179,-1766196,-11290074, 105510354,-208774399,704933861]