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A304167 as a simple table

n a(n)
1 4
2 9
3 25
4 75
5 229
6 699
7 2125
8 6435
9 19429
10 58539
11 176125
12 529395
13 1590229
14 4774779
15 14332525
16 43013955
17 129074629
18 387289419
19 1161999325
20 3486260115
21 10459304629
22 31378962459
23 94138984525
24 282421147875
25 847271832229
26 2541832273899
27 7625530376125
28 22876658237235
29 68630108929429
30 205890595223739

[4,9,25,75,229,699,2125,6435,19429,58539,176125,
 529395,1590229,4774779,14332525,43013955,
 129074629,387289419,1161999325,3486260115,
 10459304629,31378962459,94138984525,282421147875,
 847271832229,2541832273899,7625530376125,
 22876658237235,68630108929429,205890595223739]

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Last modified April 19 06:59 EDT 2019. Contains 322237 sequences. (Running on oeis4.)