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.

A385983 a(0) = 1; a(n) = Sum_{k=0..n-1} 3^k * binomial(n-1,k) * a(k) * a(n-1-k).

Table of values

n a(n)
0 1
1 1
2 4
3 46
4 1432
5 123808
6 30876832
7 22731703408
8 49898049707776
9 327831911519538304
10 6455998409280026369536
11 381291302353791118798096384
12 67549186687935750257213597283328
13 35899285521583612190120694413539704832
14 57235559192922896714567337515980987820597248

List of values

[1, 1, 4, 46, 1432, 123808, 30876832, 22731703408, 49898049707776, 327831911519538304, 6455998409280026369536, 381291302353791118798096384, 67549186687935750257213597283328, 35899285521583612190120694413539704832, 57235559192922896714567337515980987820597248]