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A009406 as a simple table

n a(n)
0 0
1 1
2 -1
3 -1
4 0
5 29
6 -105
7 307
8 -2744
9 27417
10 -236025
11 2249895
12 -25156296
13 306281013
14 -3983598801
15 55800877467
16 -839348702160
17 13462454942385
18 -229273833323025
19 4133677629311823
20 -78661216493101680
21 1575432052386178509

[0,1,-1,-1,0,29,-105,307,-2744,27417,-236025,
 2249895,-25156296,306281013,-3983598801,
 55800877467,-839348702160,13462454942385,
 -229273833323025,4133677629311823,
 -78661216493101680,1575432052386178509]

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Last modified February 6 05:07 EST 2023. Contains 360097 sequences. (Running on oeis4.)