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A217212 as a simple table

n a(n)
1 0
2 0
3 2
4 2
5 4
6 10
7 20
8 38
9 82
10 164
11 328
12 660
13 1320
14 2640
15 5304
16 10596
17 21192
18 42424
19 84848
20 169668
21 339428
22 678856
23 1357712
24 2715548
25 5431096
26 10862192
27 21724746
28 43449380
29 86898760
30 173798220
31 347596440
32 695192670

[0,0,2,2,4,10,20,38,82,164,328,660,1320,2640,5304,
 10596,21192,42424,84848,169668,339428,678856,
 1357712,2715548,5431096,10862192,21724746,
 43449380,86898760,173798220,347596440,695192670]

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Last modified September 15 16:35 EDT 2024. Contains 375938 sequences. (Running on oeis4.)