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A002528 as a simple table

n a(n)
0 0
1 0
2 2
3 4
4 12
5 32
6 108
7 336
8 1036
9 3120
10 9540
11 29244
12 89768
13 274788
14 840936
15 2573972
16 7881922
17 24135000
18 73897320
19 226249264
20 692714696
21 2120941424
22 6493883944
23 19882820480
24 60876609464
25 186390208744
26 570684661408
27 1747307671896
28 5349860697088

[0,0,2,4,12,32,108,336,1036,3120,9540,29244,89768,
 274788,840936,2573972,7881922,24135000,73897320,
 226249264,692714696,2120941424,6493883944,
 19882820480,60876609464,186390208744,570684661408,
 1747307671896,5349860697088]

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Last modified April 23 05:09 EDT 2024. Contains 371906 sequences. (Running on oeis4.)