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A013228 as a simple table

n a(n)
0 0
1 0
2 -1
3 1
4 -6
5 15
6 -105
7 390
8 -3500
9 15785
10 -188685
11 946350
12 -15864750
13 90057825
14 -2127610485
15 15254857800
16 -444774915000
17 4213468013625
18 -130378398500025
19 1538133793366950
20 -48054409884965250

[0,0,-1,1,-6,15,-105,390,-3500,15785,-188685,
 946350,-15864750,90057825,-2127610485,15254857800,
 -444774915000,4213468013625,-130378398500025,
 1538133793366950,-48054409884965250]

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Last modified February 23 21:40 EST 2024. Contains 370288 sequences. (Running on oeis4.)