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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.

A356131 a(n) = Sum_{k=1..n} (k - 1)^n * binomial(floor(n/k)+1,2).

Table of values

n a(n)
1 0
2 1
3 9
4 100
5 1302
6 20648
7 377022
8 7921039
9 186926431
10 4916562309
11 142373072781
12 4506381442625
13 154721361953489
14 5729251983077521
15 227585590018322461
16 9654855432715969784
17 435659531345223039702
18 20836069677785611552293

List of values

[0, 1, 9, 100, 1302, 20648, 377022, 7921039, 186926431, 4916562309, 142373072781, 4506381442625, 154721361953489, 5729251983077521, 227585590018322461, 9654855432715969784, 435659531345223039702, 20836069677785611552293]

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

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