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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.

A137781 a(n) = (2^prime(n) + 2^prime(n+1)) / 4.

Table of values

n a(n)
1 3
2 10
3 40
4 544
5 2560
6 34816
7 163840
8 2228224
9 136314880
10 671088640
11 34896609280
12 584115552256
13 2748779069440
14 37383395344384
15 2286984185774080
16 146366987889541120
17 720575940379279360
18 37469948899722526720
19 627189298506124754944

List of values

[3, 10, 40, 544, 2560, 34816, 163840, 2228224, 136314880, 671088640, 34896609280, 584115552256, 2748779069440, 37383395344384, 2286984185774080, 146366987889541120, 720575940379279360, 37469948899722526720, 627189298506124754944]

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

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