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.

A117262 Triangle T, read by rows, where matrix inverse T^-1 has -3^n in the secondary diagonal: [T^-1](n+1,n) = -3^n, with all 1's in the main diagonal and zeros elsewhere.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 3
5 1
6 27
7 27
8 9
9 1
10 729
11 729
12 243
13 27
14 1
15 59049
16 59049
17 19683
18 2187
19 81
20 1
21 14348907
22 14348907
23 4782969
24 531441
25 19683
26 243
27 1
28 10460353203
29 10460353203
30 3486784401
31 387420489
32 14348907
33 177147
34 729
35 1

List of values

[1, 1, 1, 3, 3, 1, 27, 27, 9, 1, 729, 729, 243, 27, 1, 59049, 59049, 19683, 2187, 81, 1, 14348907, 14348907, 4782969, 531441, 19683, 243, 1, 10460353203, 10460353203, 3486784401, 387420489, 14348907, 177147, 729, 1]