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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.

A296143 Number of configurations, excluding reflections and color swaps, of n beads each of three colors on a string.

Table of values

n a(n)
1 1
2 11
3 148
4 2955
5 63231
6 1430912
7 33259920
8 788827215
9 18989544145
10 462583897776
11 11377251858336
12 282061000649064
13 7039841561638536
14 176714389335432960
15 4457914983511649088
16 112945455380006673039
17 2872488224771372668725
18 73301643957476400237200
19 1876197202671454764901800
20 48152601206547990689466930

List of values

[1, 11, 148, 2955, 63231, 1430912, 33259920, 788827215, 18989544145, 462583897776, 11377251858336, 282061000649064, 7039841561638536, 176714389335432960, 4457914983511649088, 112945455380006673039, 2872488224771372668725, 73301643957476400237200, 1876197202671454764901800, 48152601206547990689466930]

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

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