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A015680 as a simple table

n a(n)
0 1
1 -1
2 3
3 -15
4 81
5 -585
6 4995
7 -46935
8 499905
9 -6109425
10 79791075
11 -1138096575
12 17774982225
13 -294439570425
14 5240530570275
15 -100050497922375
16 2002010508122625
17 -42495475420022625
18 954152290944727875

[1,-1,3,-15,81,-585,4995,-46935,499905,-6109425,
 79791075,-1138096575,17774982225,-294439570425,
 5240530570275,-100050497922375,2002010508122625,
 -42495475420022625,954152290944727875]

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Last modified January 21 22:08 EST 2022. Contains 350480 sequences. (Running on oeis4.)