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A208105 as a simple table

n a(n)
1 15
2 225
3 611
4 1805
5 6235
6 22995
7 89815
8 361261
9 1483295
10 6161925
11 25792655
12 108453119
13 457324951
14 1931799849
15 8168996779
16 34567178365
17 146331546515
18 619615536891
19 2624066727095
20 11113979515925
21 47075003890759

[15,225,611,1805,6235,22995,89815,361261,1483295,
 6161925,25792655,108453119,457324951,1931799849,
 8168996779,34567178365,146331546515,619615536891,
 2624066727095,11113979515925,47075003890759]

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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)