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.

A203831 Number of (n+1)X5 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements.

Table of values

n a(n)
1 5625
2 151659
3 4238721
4 119606211
5 3383285769
6 95763046491
7 2710984443345
8 76749227497395
9 2172829037910489
10 61514609224652235
11 1741531281545538081
12 49304251065416837283
13 1395845890054082693289
14 39517602012270762571323

List of values

[5625, 151659, 4238721, 119606211, 3383285769, 95763046491, 2710984443345, 76749227497395, 2172829037910489, 61514609224652235, 1741531281545538081, 49304251065416837283, 1395845890054082693289, 39517602012270762571323]