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.

A317421 a(n) = Sum_{k=1..n} binomial(n-1,k-1)*prime(k)*n!/k!.

Table of values

n a(n)
1 2
2 7
3 35
4 223
5 1711
6 15283
7 155333
8 1766819
9 22205615
10 305275979
11 4553222111
12 73179347509
13 1260129395189
14 23135381385341
15 450963438488267
16 9298480714769813
17 202154606388513675
18 4620729025472999443
19 110759284511324893795
20 2777748141259276697671
21 72735279236489471934853

List of values

[2, 7, 35, 223, 1711, 15283, 155333, 1766819, 22205615, 305275979, 4553222111, 73179347509, 1260129395189, 23135381385341, 450963438488267, 9298480714769813, 202154606388513675, 4620729025472999443, 110759284511324893795, 2777748141259276697671, 72735279236489471934853]