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A004403 as a simple table

n a(n)
0 1
1 -4
2 12
3 -32
4 76
5 -168
6 352
7 -704
8 1356
9 -2532
10 4600
11 -8160
12 14176
13 -24168
14 40512
15 -66880
16 108876
17 -174984
18 277932
19 -436640
20 679032
21 -1046016
22 1597088
23 -2418240
24 3632992
25 -5417708
26 8022840
27 -11802176
28 17252928
29 -25070568
30 36223424
31 -52053760
32 74414412

[1,-4,12,-32,76,-168,352,-704,1356,-2532,4600,
 -8160,14176,-24168,40512,-66880,108876,-174984,
 277932,-436640,679032,-1046016,1597088,-2418240,
 3632992,-5417708,8022840,-11802176,17252928,
 -25070568,36223424,-52053760,74414412]

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Last modified June 26 00:10 EDT 2019. Contains 324367 sequences. (Running on oeis4.)