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.

A209498 Number of nX3 0..4 arrays with every 2X2 subblock containing exactly one value repeat, and new values 0..4 introduced in row major order.

Table of values

n a(n)
1 5
2 57
3 1938
4 78135
5 3268686
6 137627625
7 5801378991
8 244591579065
9 10312560758853
10 434804544586449
11 18332515897436133
12 772947757887140085
13 32589539696259731973
14 1374061949636494558605
15 57934118148061257233025

List of values

[5, 57, 1938, 78135, 3268686, 137627625, 5801378991, 244591579065, 10312560758853, 434804544586449, 18332515897436133, 772947757887140085, 32589539696259731973, 1374061949636494558605, 57934118148061257233025]

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

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