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.

A181334 Let f(n) = Sum_{j>=1} j^n/binomial(2*j,j) = r_n*Pi*sqrt(3)/3^{t_n} + s_n/3; sequence gives r_n.

Table of values

n a(n)
0 2
1 2
2 10
3 74
4 238
5 938
6 13130
7 23594
8 1298462
9 26637166
10 201403930
11 5005052234
12 135226271914
13 1315508114654
14 13747435592810
15 153590068548062
16 202980764290906
17 69141791857625242
18 2766595825017102650
19 38897014541363246798
20 1724835471991750464238
21 80219728936311383557694

List of values

[2, 2, 10, 74, 238, 938, 13130, 23594, 1298462, 26637166, 201403930, 5005052234, 135226271914, 1315508114654, 13747435592810, 153590068548062, 202980764290906, 69141791857625242, 2766595825017102650, 38897014541363246798, 1724835471991750464238, 80219728936311383557694]