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A123642 as a simple table

n a(n)
0 0
1 -1
2 -2
3 -2
4 8
5 88
6 656
7 4912
8 40064
9 362368
10 3627776
11 39914752
12 478997504
13 6227012608
14 87178274816
15 1307674335232
16 20922789822464
17 355687427964928
18 6402373705465856
19 121645100408307712
20 2432902008175591424
21 51090942171707342848
22 1124000727777603485696

[0,-1,-2,-2,8,88,656,4912,40064,362368,3627776,
 39914752,478997504,6227012608,87178274816,
 1307674335232,20922789822464,355687427964928,
 6402373705465856,121645100408307712,
 2432902008175591424,51090942171707342848,
 1124000727777603485696]

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)