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.

A203651 1/25 the number of (n+1) X 4 0..4 arrays with every 2 X 2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 729
2 28057
3 1116249
4 44577561
5 1780968921
6 71156938905
7 2843024036697
8 113591039131161
9 4538450923550937
10 181330649884558233
11 7244939996157320793
12 289466538539290446105
13 11565434217440894223321
14 462088880162456091840153

List of values

[729, 28057, 1116249, 44577561, 1780968921, 71156938905, 2843024036697, 113591039131161, 4538450923550937, 181330649884558233, 7244939996157320793, 289466538539290446105, 11565434217440894223321, 462088880162456091840153]

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

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