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.

A036222 Expansion of 1/(1-3*x)^9; 9-fold convolution of A000244 (powers of 3).

Table of values

n a(n)
0 1
1 27
2 405
3 4455
4 40095
5 312741
6 2189187
7 14073345
8 84440070
9 478493730
10 2583866142
11 13389124554
12 66945622770
13 324428787270
14 1529449997130
15 7035469986798
16 31659614940591
17 139674771796725
18 605257344452475

List of values

[1, 27, 405, 4455, 40095, 312741, 2189187, 14073345, 84440070, 478493730, 2583866142, 13389124554, 66945622770, 324428787270, 1529449997130, 7035469986798, 31659614940591, 139674771796725, 605257344452475]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.