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A053565 as a simple table

n a(n)
0 -2
1 -1
2 4
3 20
4 64
5 176
6 448
7 1088
8 2560
9 5888
10 13312
11 29696
12 65536
13 143360
14 311296
15 671744
16 1441792
17 3080192
18 6553600
19 13893632
20 29360128
21 61865984
22 130023424
23 272629760
24 570425344
25 1191182336
26 2483027968
27 5167382528
28 10737418240

[-2,-1,4,20,64,176,448,1088,2560,5888,13312,29696,
 65536,143360,311296,671744,1441792,3080192,
 6553600,13893632,29360128,61865984,130023424,
 272629760,570425344,1191182336,2483027968,
 5167382528,10737418240]

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Last modified September 21 19:57 EDT 2020. Contains 337273 sequences. (Running on oeis4.)