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A184223 as a simple table

n a(n)
1 15
2 57
3 180
4 621
5 2061
6 6966
7 23355
8 78597
9 264060
10 887841
11 2984121
12 10031526
13 33719895
14 113349537
15 381019140
16 1280786661
17 4305320181
18 14472205686
19 48647857635
20 163528268877
21 549695145420
22 1847783097081
23 6211265114241

[15,57,180,621,2061,6966,23355,78597,264060,
 887841,2984121,10031526,33719895,113349537,
 381019140,1280786661,4305320181,14472205686,
 48647857635,163528268877,549695145420,
 1847783097081,6211265114241]

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Last modified April 23 13:04 EDT 2024. Contains 371913 sequences. (Running on oeis4.)