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.

A199648 Number of n X n 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.

Table of values

n a(n)
1 1
2 14
3 2584
4 3695683
5 39209840355
6 3083761998081891
7 1797997097480559332224
8 7771716024559573445914487875

List of values

[1, 14, 2584, 3695683, 39209840355, 3083761998081891, 1797997097480559332224, 7771716024559573445914487875]

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

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