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.

A098430 a(n) = 4^n*(2*n)!/(n!)^2.

Table of values

n a(n)
0 1
1 8
2 96
3 1280
4 17920
5 258048
6 3784704
7 56229888
8 843448320
9 12745441280
10 193730707456
11 2958796259328
12 45368209309696
13 697972450918400
14 10768717814169600
15 166556168859156480
16 2581620617316925440
17 40091049586568724480
18 623638549124402380800
19 9715632133727531827200

List of values

[1, 8, 96, 1280, 17920, 258048, 3784704, 56229888, 843448320, 12745441280, 193730707456, 2958796259328, 45368209309696, 697972450918400, 10768717814169600, 166556168859156480, 2581620617316925440, 40091049586568724480, 623638549124402380800, 9715632133727531827200]