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A207700 as a simple table

n a(n)
1 15
2 225
3 1071
4 3321
5 8151
6 17225
7 32775
8 57681
9 95551
10 150801
11 228735
12 335625
13 478791
14 666681
15 908951
16 1216545
17 1601775
18 2078401
19 2661711
20 3368601
21 4217655
22 5229225
23 6425511
24 7830641
25 9470751
26 11374065
27 13570975
28 16094121
29 18978471

[15,225,1071,3321,8151,17225,32775,57681,95551,
 150801,228735,335625,478791,666681,908951,1216545,
 1601775,2078401,2661711,3368601,4217655,5229225,
 6425511,7830641,9470751,11374065,13570975,
 16094121,18978471]

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Last modified September 23 00:32 EDT 2021. Contains 347609 sequences. (Running on oeis4.)