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A270072 as a simple table

n a(n)
0 15
1 33
2 231
3 561
4 3735
5 8673
6 58407
7 146673
8 951831
9 2200161
10 15007527
11 37618161
12 243401751
13 562961505
14 3835839783
15 9654230001
16 62277025815
17 1438881404513
18 981400027431
19 2471753680881
20 15945066090519
21 38848671944801
22 251274914238759
23 633024492828657
24 4081389310836759
25 589338770407521
26 6431706870343299
27 161989104772314217
28 1044976403211096087

[15,33,231,561,3735,8673,58407,146673,951831,
 2200161,15007527,37618161,243401751,562961505,
 3835839783,9654230001,62277025815,1438881404513,
 981400027431,2471753680881,15945066090519,
 38848671944801,251274914238759,633024492828657,
 4081389310836759,589338770407521,6431706870343299,
 161989104772314217,1044976403211096087]

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Last modified August 3 13:57 EDT 2021. Contains 346438 sequences. (Running on oeis4.)