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.

A203653 1/25 the number of (n+1)X6 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 59049
2 9616161
3 1780968921
4 343812029649
5 67213191427593
6 13192335511091073
7 2592476403527692089
8 509649251749126118193
9 100202323670442739140969
10 19701512822564218199726049
11 3873700712374667692894221465

List of values

[59049, 9616161, 1780968921, 343812029649, 67213191427593, 13192335511091073, 2592476403527692089, 509649251749126118193, 100202323670442739140969, 19701512822564218199726049, 3873700712374667692894221465]

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

Content is available under The OEIS End-User License Agreement.