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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A277105 a(n) = (27*3^n - 63)/2.

Table of values

n a(n)
1 9
2 90
3 333
4 1062
5 3249
6 9810
7 29493
8 88542
9 265689
10 797130
11 2391453
12 7174422
13 21523329
14 64570050
15 193710213
16 581130702
17 1743392169
18 5230176570
19 15690529773
20 47071589382
21 141214768209
22 423644304690
23 1270932914133
24 3812798742462
25 11438396227449
26 34315188682410
27 102945566047293
28 308836698141942
29 926510094425889

List of values

[9, 90, 333, 1062, 3249, 9810, 29493, 88542, 265689, 797130, 2391453, 7174422, 21523329, 64570050, 193710213, 581130702, 1743392169, 5230176570, 15690529773, 47071589382, 141214768209, 423644304690, 1270932914133, 3812798742462, 11438396227449, 34315188682410, 102945566047293, 308836698141942, 926510094425889]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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