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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.

A201228 Number of n X n 0..3 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.

Table of values

n a(n)
1 4
2 2
3 114
4 1028
5 420662
6 33222962
7 112920979339

List of values

[4, 2, 114, 1028, 420662, 33222962, 112920979339]

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

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