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A183512 as a simple table

n a(n)
1 4
2 24
3 138
4 736
5 3504
6 18288
7 94376
8 490864
9 2559872
10 13257792
11 68885664
12 357944960
13 1859678592
14 9662769152
15 50202415232
16 260834073856
17 1355207165440
18 7041216239616
19 36583863431680
20 190077441806336
21 987579713175552

[4,24,138,736,3504,18288,94376,490864,2559872,
 13257792,68885664,357944960,1859678592,9662769152,
 50202415232,260834073856,1355207165440,
 7041216239616,36583863431680,190077441806336,
 987579713175552]

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Last modified April 25 12:33 EDT 2024. Contains 371969 sequences. (Running on oeis4.)