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A288476 as a simple table

n a(n)
0 2
1 4
2 8
3 20
4 44
5 108
6 244
7 588
8 1348
9 3212
10 7428
11 17580
12 40868
13 96332
14 224644
15 528236
16 1234148
17 2897804
18 6777924
19 15900844
20 37216932
21 87264460
22 204330500
23 478954476
24 1121747556
25 2628904460
26 6157985732
27 14430108460
28 33804242468
29 79208704844
30 185565457796

[2,4,8,20,44,108,244,588,1348,3212,7428,17580,
 40868,96332,224644,528236,1234148,2897804,6777924,
 15900844,37216932,87264460,204330500,478954476,
 1121747556,2628904460,6157985732,14430108460,
 33804242468,79208704844,185565457796]

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Last modified April 14 22:47 EDT 2021. Contains 342971 sequences. (Running on oeis4.)