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.

A248049 a(n) = (a(n-1) + a(n-2)) * (a(n-2) + a(n-3)) / a(n-4) with a(0) = 2, a(1) = a(2) = a(3) = 1.

Table of values

n a(n)
0 2
1 1
2 1
3 1
4 2
5 6
6 24
7 240
8 3960
9 184800
10 33033000
11 26125799700
12 219429008298500
13 31064340573760168675
14 206377779224083011749949745
15 245390990689739612867279321757020455
16 230795626149641527446533813473152766756062242744

List of values

[2, 1, 1, 1, 2, 6, 24, 240, 3960, 184800, 33033000, 26125799700, 219429008298500, 31064340573760168675, 206377779224083011749949745, 245390990689739612867279321757020455, 230795626149641527446533813473152766756062242744]