cp's OEIS Frontend

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.

A181137 The number of ways to color n balls in a row with 3 colors with no color runs having lengths greater than 3.

Table of values

n a(n)
0 1
1 3
2 9
3 27
4 78
5 228
6 666
7 1944
8 5676
9 16572
10 48384
11 141264
12 412440
13 1204176
14 3515760
15 10264752
16 29969376
17 87499776
18 255467808
19 745873920
20 2177683008
21 6358049472
22 18563212800
23 54197890560
24 158238305664
25 461998818048
26 1348870028544
27 3938214304512

List of values

[1, 3, 9, 27, 78, 228, 666, 1944, 5676, 16572, 48384, 141264, 412440, 1204176, 3515760, 10264752, 29969376, 87499776, 255467808, 745873920, 2177683008, 6358049472, 18563212800, 54197890560, 158238305664, 461998818048, 1348870028544, 3938214304512]

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

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