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.

A268047 Number of nX3 0..3 arrays with every repeated value in every row unequal to, and in every column equal to, the previous repeated value, and new values introduced in row-major sequential order.

Table of values

n a(n)
1 4
2 159
3 9054
4 467899
5 22309009
6 999810316
7 42764566838
8 1764109373799
9 70707661248442
10 2768685594929370
11 106349114580207849
12 4020025709583200998
13 149916029504065737481
14 5526692782368686983855
15 201739654709622213459404

List of values

[4, 159, 9054, 467899, 22309009, 999810316, 42764566838, 1764109373799, 70707661248442, 2768685594929370, 106349114580207849, 4020025709583200998, 149916029504065737481, 5526692782368686983855, 201739654709622213459404]

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

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