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A156921 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -6
5 1
6 7
7 -79
8 119
9 126
10 -270
11 1
12 28
13 -515
14 1654
15 8689
16 -65864
17 142371
18 -82242
19 -99090
20 113400
21 1
22 86
23 -2255
24 5784
25 300930
26 -3904584
27 20663714
28 -41517272
29 -80232259
30 657717054

[1,1,1,1,-6,1,7,-79,119,126,-270,1,28,-515,1654,
 8689,-65864,142371,-82242,-99090,113400,1,86,
 -2255,5784,300930,-3904584,20663714,-41517272,
 -80232259,657717054]

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Last modified March 18 12:10 EDT 2019. Contains 321283 sequences. (Running on oeis4.)