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.

A280556 a(n) = Sum_{k=1..n} k^2 * (k+1)!.

Table of values

n a(n)
0 0
1 2
2 26
3 242
4 2162
5 20162
6 201602
7 2177282
8 25401602
9 319334402
10 4311014402
11 62270208002
12 958961203202
13 15692092416002
14 271996268544002
15 4979623993344002
16 96035605585920002
17 1946321606541312002
18 41359334139002880002
19 919636959090769920002
20 21356013827774545920002

List of values

[0, 2, 26, 242, 2162, 20162, 201602, 2177282, 25401602, 319334402, 4311014402, 62270208002, 958961203202, 15692092416002, 271996268544002, 4979623993344002, 96035605585920002, 1946321606541312002, 41359334139002880002, 919636959090769920002, 21356013827774545920002]

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

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