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A009820 as a simple table

n a(n)
0 0
1 1
2 -1
3 -2
4 18
5 -44
6 -300
7 3928
8 -12544
9 -193160
10 3128040
11 -11235872
12 -311721168
13 5932512496
14 -21553521808
15 -1023800851712
16 21959034049920
17 -72153838392704
18 -5963595925511808
19 139976498126622976
20 -351219561048021760

[0,1,-1,-2,18,-44,-300,3928,-12544,-193160,
 3128040,-11235872,-311721168,5932512496,
 -21553521808,-1023800851712,21959034049920,
 -72153838392704,-5963595925511808,
 139976498126622976,-351219561048021760]

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Last modified July 18 10:00 EDT 2024. Contains 374378 sequences. (Running on oeis4.)