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.

A222880 Number of 3Xn 0..3 arrays with no more than floor(3Xn/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

Table of values

n a(n)
1 5
2 131
3 6282
4 409775
5 19707855
6 1340197778
7 66248732403
8 4552388850792
9 228017377191609
10 15767959380970741
11 797585318305106129
12 55339415802965980962
13 2819443488435447752525
14 196019624814751455019691

List of values

[5, 131, 6282, 409775, 19707855, 1340197778, 66248732403, 4552388850792, 228017377191609, 15767959380970741, 797585318305106129, 55339415802965980962, 2819443488435447752525, 196019624814751455019691]

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

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