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A087220 as a simple table

n a(n)
0 1
1 2
2 -2
3 -12
4 126
5 -84
6 -10532
7 72584
8 1398454
9 -23934644
10 -279791836
11 10005551128
12 74538179116
13 -5628788533000
14 -20339727800264
15 4187789575589776
16 -1855072071151834
17 -4010464443848609780

[1,2,-2,-12,126,-84,-10532,72584,1398454,
 -23934644,-279791836,10005551128,74538179116,
 -5628788533000,-20339727800264,4187789575589776,
 -1855072071151834,-4010464443848609780]

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)