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A013120 as a simple table

n a(n)
0 0
1 2
2 -1
3 16
4 -54
5 612
6 -4710
7 57944
8 -683144
9 10015344
10 -154359720
11 2701047424
12 -50673755088
13 1040194570144
14 -22870244075952
15 540441764640064
16 -13599312731310720
17 363949691199176448
18 -10307618997050443392

[0,2,-1,16,-54,612,-4710,57944,-683144,10015344,
 -154359720,2701047424,-50673755088,1040194570144,
 -22870244075952,540441764640064,
 -13599312731310720,363949691199176448,
 -10307618997050443392]

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Last modified December 1 23:44 EST 2022. Contains 358485 sequences. (Running on oeis4.)