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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.

A368767 a(n) = n! * (1 + Sum_{k=0..n} (-1)^k * binomial(k+2,3) / k!).

Table of values

n a(n)
0 1
1 0
2 4
3 2
4 28
5 105
6 686
7 4718
8 37864
9 340611
10 3406330
11 37469344
12 449632492
13 5845221941
14 81833107734
15 1227496615330
16 19639945846096
17 333879079382663
18 6009823428889074
19 114186645148891076
20 2283732902977823060
21 47958390962534282489
22 1055084601175754216782

List of values

[1, 0, 4, 2, 28, 105, 686, 4718, 37864, 340611, 3406330, 37469344, 449632492, 5845221941, 81833107734, 1227496615330, 19639945846096, 333879079382663, 6009823428889074, 114186645148891076, 2283732902977823060, 47958390962534282489, 1055084601175754216782]

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

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