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.

A362305 a(n) = n! * Sum_{k=0..floor(n/3)} (-n)^k * binomial(n-2*k,k)/(n-2*k)!.

Table of values

n a(n)
0 1
1 1
2 1
3 -17
4 -95
5 -299
6 12241
7 122011
8 642433
9 -41645015
10 -597247199
11 -4407324569
12 390913189921
13 7315513279933
14 69439658097265
15 -7816418805235949
16 -180448412456686079
17 -2093964182367814319
18 285679499679525805633
19 7844019340520912230495

List of values

[1, 1, 1, -17, -95, -299, 12241, 122011, 642433, -41645015, -597247199, -4407324569, 390913189921, 7315513279933, 69439658097265, -7816418805235949, -180448412456686079, -2093964182367814319, 285679499679525805633, 7844019340520912230495]