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A013240 as a simple table

n a(n)
0 0
1 0
2 -1
3 0
4 -6
5 8
6 -105
7 448
8 -3780
9 29360
10 -239085
11 2498848
12 -23480226
13 280142744
14 -3229879653
15 41622253216
16 -582786564360
17 8232828649568
18 -134282588969529
19 2159014224301504
20 -39520792904437310

[0,0,-1,0,-6,8,-105,448,-3780,29360,-239085,
 2498848,-23480226,280142744,-3229879653,
 41622253216,-582786564360,8232828649568,
 -134282588969529,2159014224301504,
 -39520792904437310]

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Last modified January 29 04:34 EST 2023. Contains 359915 sequences. (Running on oeis4.)