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.

A200794 Number of n X n 0..3 arrays with values 0..3 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 15
3 9880
4 132636590
5 26207146328784
6 75743730886453371522
7 3202145671418507455058837791

List of values

[1, 15, 9880, 132636590, 26207146328784, 75743730886453371522, 3202145671418507455058837791]

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

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