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.

A343710 a(n) = 1 + 4 * Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).

Table of values

n a(n)
0 1
1 5
2 45
3 609
4 11009
5 248837
6 6749629
7 213596401
8 7725031521
9 314310704101
10 14209394894765
11 706617979262049
12 38333841625642785
13 2252901018519028901
14 142589176837851349757
15 9669282207517755852721
16 699408060608904410296897
17 53752166013267632536864581
18 4374061543586452325644329133

List of values

[1, 5, 45, 609, 11009, 248837, 6749629, 213596401, 7725031521, 314310704101, 14209394894765, 706617979262049, 38333841625642785, 2252901018519028901, 142589176837851349757, 9669282207517755852721, 699408060608904410296897, 53752166013267632536864581, 4374061543586452325644329133]