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A002020 as a simple table

n a(n)
0 1
1 1
2 1
3 1
4 -5
5 -17
6 83
7 593
8 -2893
9 -36101
10 172195
11 3421285
12 -15520165
13 -467129785
14 1954015955
15 86971636825
16 -323371713725
17 -21196564551725
18 66760541581475
19 6552909294409325
20 -16279195926455125
21 -2506384727801998625
22 4330877561309153875

[1,1,1,1,-5,-17,83,593,-2893,-36101,172195,
 3421285,-15520165,-467129785,1954015955,
 86971636825,-323371713725,-21196564551725,
 66760541581475,6552909294409325,
 -16279195926455125,-2506384727801998625,
 4330877561309153875]

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Last modified November 14 06:40 EST 2019. Contains 329110 sequences. (Running on oeis4.)