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A327682 as a simple table

n a(n)
0 1
1 -1
2 1
3 -5
4 14
5 -40
6 122
7 -404
8 1362
9 -4608
10 15881
11 -55709
12 197402
13 -705114
14 2539282
15 -9210196
16 33605471
17 -123262137
18 454268676
19 -1681305246
20 6246544735
21 -23288217459
22 87096982499
23 -326680267261
24 1228547420236
25 -4631474743422
26 17499462106763
27 -66257720483935
28 251356773101419

[1,-1,1,-5,14,-40,122,-404,1362,-4608,15881,
 -55709,197402,-705114,2539282,-9210196,33605471,
 -123262137,454268676,-1681305246,6246544735,
 -23288217459,87096982499,-326680267261,
 1228547420236,-4631474743422,17499462106763,
 -66257720483935,251356773101419]

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Last modified November 26 14:51 EST 2020. Contains 338640 sequences. (Running on oeis4.)