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A002969 as a simple table

n a(n)
0 1
1 1
2 0
3 -7
4 -24
5 61
6 1200
7 4493
8 -48384
9 -781319
10 -1804800
11 85444193
12 1210361856
13 -1847527499
14 -288162201600
15 -3428482320907
16 33720680349696
17 1637781983297521
18 14158399925452800
19 -431041350297034807
20 -14236987086964260864

[1,1,0,-7,-24,61,1200,4493,-48384,-781319,
 -1804800,85444193,1210361856,-1847527499,
 -288162201600,-3428482320907,33720680349696,
 1637781983297521,14158399925452800,
 -431041350297034807,-14236987086964260864]

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Last modified December 3 21:17 EST 2021. Contains 349468 sequences. (Running on oeis4.)