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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.

A200773 Number of nX4 0..2 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 7
2 20
3 31
4 342
5 1368
6 1806
7 18801
8 66784
9 80772
10 855668
11 3041384
12 3594128
13 37388832
14 130414591
15 152057520
16 1585602417
17 5503438740
18 6353866245
19 65731117389
20 226849040721
21 260912168378
22 2698875915314
23 9278417689608
24 10609858568929

List of values

[7, 20, 31, 342, 1368, 1806, 18801, 66784, 80772, 855668, 3041384, 3594128, 37388832, 130414591, 152057520, 1585602417, 5503438740, 6353866245, 65731117389, 226849040721, 260912168378, 2698875915314, 9278417689608, 10609858568929]

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

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