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A009711 as a simple table

n a(n)
0 0
1 1
2 -1
3 2
4 -6
5 16
6 0
7 -568
8 7504
9 -78248
10 739080
11 -6314848
12 44072688
13 -125928464
14 -3754236304
15 114500663552
16 -2264653307520
17 37495468333696
18 -536284797406848
19 6159440282136320
20 -34551694794080000
21 -931439976890484224

[0,1,-1,2,-6,16,0,-568,7504,-78248,739080,
 -6314848,44072688,-125928464,-3754236304,
 114500663552,-2264653307520,37495468333696,
 -536284797406848,6159440282136320,
 -34551694794080000,-931439976890484224]

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Last modified January 30 02:06 EST 2023. Contains 359939 sequences. (Running on oeis4.)