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.

A204677 Number of n X n 0..3 arrays with no occurrence of three equal elements in a row horizontally, vertically, diagonally or antidiagonally, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 1
2 15
3 6451
4 40919141
5 2579588216958

List of values

[1, 15, 6451, 40919141, 2579588216958]

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

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