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.

A109055 To compute a(n) we first write down 3^n 1's in a row. Each row takes the rightmost 3rd part of the previous row and each element in it equals sum of the elements of the previous row starting with the first of the rightmost 3rd part. The single element in the last row is a(n).

Table of values

n a(n)
0 1
1 1
2 3
3 24
4 541
5 35649
6 6979689
7 4085743032
8 7166723910237
9 37698139930450365
10 594816080266215640710
11 28154472624850002001979592
12 3997853576535778666975681355079
13 1703042427700923785323670557504832751
14 2176429411666209822350337722381643148477248

List of values

[1, 1, 3, 24, 541, 35649, 6979689, 4085743032, 7166723910237, 37698139930450365, 594816080266215640710, 28154472624850002001979592, 3997853576535778666975681355079, 1703042427700923785323670557504832751, 2176429411666209822350337722381643148477248]