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A009791 as a simple table

n a(n)
0 1
1 -4
2 68
3 -2584
4 171344
5 -17464448
6 2529148352
7 -493428887168
8 124730546544896
9 -39649824402078720
10 15479590269182063616
11 -7280988095409621465088
12 4060943278418110382329856
13 -2650034901967494261760065536

[1,-4,68,-2584,171344,-17464448,2529148352,
 -493428887168,124730546544896,-39649824402078720,
 15479590269182063616,-7280988095409621465088,
 4060943278418110382329856,
 -2650034901967494261760065536]

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Last modified March 5 15:13 EST 2021. Contains 341823 sequences. (Running on oeis4.)