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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.

A261177 Maximum value of (1/2)*Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} Sum_{l=1..n} gcd(b(i,j),b(k,l)) * ((i-k)^2+(j-l)^2) for an n X n matrix b filled with the integers 1 to n^2.

Table of values

n a(n)
1 0
2 10
3 180
4 1392
5 6149
6 21350
7 57192
8 137617
9 298864
10 593378
11 1101739
12 1936342
13 3216080

List of values

[0, 10, 180, 1392, 6149, 21350, 57192, 137617, 298864, 593378, 1101739, 1936342, 3216080]

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

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