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.

A299428 a(n) = binomial((n+1)*(2*n+1), n) * (n+1)/(2*n+1).

Table of values

n a(n)
0 1
1 4
2 63
3 1872
4 82775
5 4874688
6 358919022
7 31726703424
8 3273365223135
9 386120802767700
10 51255818495200660
11 7561964058268969440
12 1227474574989496660008
13 217398508335873934190800
14 41718377034325560258265500
15 8622580886584109407750765824
16 1909661474657747399115123743055
17 451173386162679212279972033149500

List of values

[1, 4, 63, 1872, 82775, 4874688, 358919022, 31726703424, 3273365223135, 386120802767700, 51255818495200660, 7561964058268969440, 1227474574989496660008, 217398508335873934190800, 41718377034325560258265500, 8622580886584109407750765824, 1909661474657747399115123743055, 451173386162679212279972033149500]