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.

A367963 a(n) = Sum_{j=0..n} (2*n)! / (n!*(n - j)!).

Table of values

n a(n)
0 1
1 4
2 30
3 320
4 4550
5 82152
6 1808268
7 47018400
8 1410564870
9 47959254200
10 1822451844356
11 76542978168384
12 3520976998449820
13 176048849932891600
14 9506637896416263000
15 551384997992298371520
16 34185869875523100114630
17 2256267411784526941171800
18 157938718824916894957161300

List of values

[1, 4, 30, 320, 4550, 82152, 1808268, 47018400, 1410564870, 47959254200, 1822451844356, 76542978168384, 3520976998449820, 176048849932891600, 9506637896416263000, 551384997992298371520, 34185869875523100114630, 2256267411784526941171800, 157938718824916894957161300]