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.

A222881 Number of 4Xn 0..3 arrays with no more than floor(4Xn/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 15
2 2150
3 443510
4 95867967
5 20978414941
6 4643150795564
7 1036481888251762
8 232912437941917635
9 52614561200004212957
10 11936312777288007185980
11 2717468404561524996790251
12 620503805193057253513443782

List of values

[15, 2150, 443510, 95867967, 20978414941, 4643150795564, 1036481888251762, 232912437941917635, 52614561200004212957, 11936312777288007185980, 2717468404561524996790251, 620503805193057253513443782]

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

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