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.

A333982 a(0) = 0; a(n) = 3^(n-1) + (1/n) * Sum_{k=1..n-1} binomial(n,k)^2 * 3^(k-1) * (n-k) * a(n-k).

Table of values

n a(n)
0 0
1 1
2 5
3 48
4 909
5 28836
6 1371384
7 91308708
8 8106024861
9 925225277004
10 132007041682380
11 23019553116101268
12 4817014157800460664
13 1191268407723761654964
14 343706793228408937835772
15 114423311913128119741898268
16 43534429651349601213257298621
17 18771927426013054800534345817884
18 9106204442628918977341144456510260

List of values

[0, 1, 5, 48, 909, 28836, 1371384, 91308708, 8106024861, 925225277004, 132007041682380, 23019553116101268, 4817014157800460664, 1191268407723761654964, 343706793228408937835772, 114423311913128119741898268, 43534429651349601213257298621, 18771927426013054800534345817884, 9106204442628918977341144456510260]