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.

A343840 a(n) = Sum_{k=0..n}(-1)^(n-k)*binomial(n, k)*|A021009(n, k)|.

Table of values

n a(n)
0 1
1 0
2 -5
3 22
4 9
5 -1244
6 14335
7 -79470
8 -586943
9 25131304
10 -434574909
11 4418399470
12 8524321465
13 -1771817986548
14 53502570125719
15 -1052208254769014
16 11804172888840705
17 131741085049224400
18 -12970386000411511733
19 482732550618027365574
20 -12599999790172579025879

List of values

[1, 0, -5, 22, 9, -1244, 14335, -79470, -586943, 25131304, -434574909, 4418399470, 8524321465, -1771817986548, 53502570125719, -1052208254769014, 11804172888840705, 131741085049224400, -12970386000411511733, 482732550618027365574, -12599999790172579025879]