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A009161 as a simple table

n a(n)
0 1
1 -1
2 2
3 -4
4 16
5 -56
6 328
7 -1576
8 11712
9 -70912
10 638720
11 -4668544
12 49459840
13 -423673472
14 5159926528
15 -50674728448
16 697030680576
17 -7717401038848
18 118233272496128
19 -1456461190426624
20 24578235697610752
21 -333308651379949568

[1,-1,2,-4,16,-56,328,-1576,11712,-70912,638720,
 -4668544,49459840,-423673472,5159926528,
 -50674728448,697030680576,-7717401038848,
 118233272496128,-1456461190426624,
 24578235697610752,-333308651379949568]

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Last modified July 13 17:35 EDT 2024. Contains 374284 sequences. (Running on oeis4.)