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A128416 as a simple table

n a(n)
0 1
1 -4
2 9
3 -24
4 69
5 -204
6 609
7 -1824
8 5469
9 -16404
10 49209
11 -147624
12 442869
13 -1328604
14 3985809
15 -11957424
16 35872269
17 -107616804
18 322850409
19 -968551224
20 2905653669
21 -8716961004
22 26150883009
23 -78452649024
24 235357947069
25 -706073841204
26 2118221523609

[1,-4,9,-24,69,-204,609,-1824,5469,-16404,49209,
 -147624,442869,-1328604,3985809,-11957424,
 35872269,-107616804,322850409,-968551224,
 2905653669,-8716961004,26150883009,-78452649024,
 235357947069,-706073841204,2118221523609]

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Last modified December 7 02:20 EST 2023. Contains 367622 sequences. (Running on oeis4.)