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.

A268178 Number of nX3 0..3 arrays with every repeated value in every row equal to, and in every column unequal to, the previous repeated value, and new values introduced in row-major sequential order.

Table of values

n a(n)
1 5
2 187
3 9054
4 494098
5 25770278
6 1339895662
7 68390077014
8 3463876525750
9 173821913942582
10 8669861062288198
11 430055421776241462
12 21243060963214339750
13 1045628843830767904502
14 51323318125992835472806

List of values

[5, 187, 9054, 494098, 25770278, 1339895662, 68390077014, 3463876525750, 173821913942582, 8669861062288198, 430055421776241462, 21243060963214339750, 1045628843830767904502, 51323318125992835472806]