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.

A223058 Number of nX4 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.

Table of values

n a(n)
1 15
2 1473
3 213469
4 31331820
5 4606719559
6 677531592132
7 99653055754459
8 14657362298142480
9 2155865978887475959
10 317093854966287823308
11 46639503202294456685971
12 6859935143940031077127272

List of values

[15, 1473, 213469, 31331820, 4606719559, 677531592132, 99653055754459, 14657362298142480, 2155865978887475959, 317093854966287823308, 46639503202294456685971, 6859935143940031077127272]

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

Content is available under The OEIS End-User License Agreement.