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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.

A198658 Number of nX4 0..7 arrays with values 0..7 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.

Table of values

n a(n)
1 2
2 76
3 3904
4 344044
5 40065880
6 6046334324
7 1099981072751
8 231069206905205
9 53332894057280732
10 13062771135606107106
11 3312119561085281340968
12 856694689962959996618514
13 224079649012945587508397744

List of values

[2, 76, 3904, 344044, 40065880, 6046334324, 1099981072751, 231069206905205, 53332894057280732, 13062771135606107106, 3312119561085281340968, 856694689962959996618514, 224079649012945587508397744]

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

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