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.

A386864 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(4*n+1,k) * binomial(4*n-k-1,n-k).

Table of values

n a(n)
0 1
1 11
2 228
3 5350
4 132476
5 3380955
6 87974188
7 2320223552
8 61804459260
9 1658904186124
10 44796539697968
11 1215611557398534
12 33121179085639252
13 905520072985022570
14 24828701435772435528
15 682496748843439692868
16 18801742541632193099996
17 518957827806105486222372

List of values

[1, 11, 228, 5350, 132476, 3380955, 87974188, 2320223552, 61804459260, 1658904186124, 44796539697968, 1215611557398534, 33121179085639252, 905520072985022570, 24828701435772435528, 682496748843439692868, 18801742541632193099996, 518957827806105486222372]