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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.

A165149 a(n) = (3*9^n - 5^n)/2.

Table of values

n a(n)
0 1
1 11
2 109
3 1031
4 9529
5 87011
6 789349
7 7135391
8 64374769
9 580154171
10 5225293789
11 47047175351
12 423522234409
13 3812188390931
14 34312136924629
15 308821439352911
16 2779453989332449
17 25015391079773291
18 225140045596865869
19 2026268039766324071
20 18236450504869572889
21 164128245278689437251

List of values

[1, 11, 109, 1031, 9529, 87011, 789349, 7135391, 64374769, 580154171, 5225293789, 47047175351, 423522234409, 3812188390931, 34312136924629, 308821439352911, 2779453989332449, 25015391079773291, 225140045596865869, 2026268039766324071, 18236450504869572889, 164128245278689437251]

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

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