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A135256 as a simple table

n a(n)
1 1
2 2
3 -1
4 12
5 -8
6 1
7 144
8 -108
9 20
10 -1
11 3600
12 -2844
13 608
14 -45
15 1
16 172800
17 -140112
18 32028
19 -2768
20 93
21 -1
22 15724800
23 -12922992
24 3054660
25 -283916
26 11231
27 -184
28 1
29 2641766400
30 -2186787456
31 526105872
32 -50752548
33 2170724
34 -42143
35 352
36 -1
37 808380518400
38 -671798727936
39 163175184288
40 -16056385560

[1,2,-1,12,-8,1,144,-108,20,-1,3600,-2844,608,-45,
 1,172800,-140112,32028,-2768,93,-1,15724800,
 -12922992,3054660,-283916,11231,-184,1,2641766400,
 -2186787456,526105872,-50752548,2170724,-42143,
 352,-1,808380518400,-671798727936,163175184288,
 -16056385560]

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Last modified July 12 21:31 EDT 2020. Contains 335669 sequences. (Running on oeis4.)