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.

A356628 a(n) = n! * Sum_{k=0..floor(n/2)} (n - 2*k)^k/(n - 2*k)!.

Table of values

n a(n)
0 1
1 1
2 1
3 7
4 25
5 181
6 1561
7 12811
8 188497
9 2071945
10 38889361
11 620762671
12 12917838121
13 291278938237
14 6667342764265
15 194869722610291
16 5137978752994081
17 177509783765281681
18 5610285632192738977
19 215195998789004395735
20 8228064506323330305721

List of values

[1, 1, 1, 7, 25, 181, 1561, 12811, 188497, 2071945, 38889361, 620762671, 12917838121, 291278938237, 6667342764265, 194869722610291, 5137978752994081, 177509783765281681, 5610285632192738977, 215195998789004395735, 8228064506323330305721]