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.

A205305 Number of nX3 0..3 arrays with no occurrence of three equal elements in a row horizontally or vertically, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 4
2 159
3 7445
4 381958
5 19490790
6 996536552
7 50933680120
8 2603456557653
9 133072628448179
10 6801873967993408
11 347670725973943044
12 17770830778194675356
13 908337669425005770376
14 46428742540607711341143

List of values

[4, 159, 7445, 381958, 19490790, 996536552, 50933680120, 2603456557653, 133072628448179, 6801873967993408, 347670725973943044, 17770830778194675356, 908337669425005770376, 46428742540607711341143]

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

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