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.

A239149 Number of (n+1)X(n+1) 0..3 arrays with no element equal to all horizontal neighbors or unequal to all vertical neighbors, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 1
2 2
3 868
4 135766
5 821135900
6 5427557363908
7 486439997897622259
8 105891766683961733641397

List of values

[1, 2, 868, 135766, 821135900, 5427557363908, 486439997897622259, 105891766683961733641397]

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

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