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.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 169 |
| 3 | 2197 |
| 4 | 28561 |
| 5 | 371293 |
| 6 | 4826809 |
| 7 | 62748517 |
| 8 | 815730721 |
| 9 | 10604499373 |
| 10 | 137858491849 |
| 11 | 1792160394037 |
| 12 | 23298085122481 |
| 13 | 302875106592253 |
| 14 | 3937376385699289 |
| 15 | 51185893014090757 |
| 16 | 665416609183179841 |
| 17 | 8650415919381337933 |
| 18 | 112455406951957393129 |
| 19 | 1461920290375446110677 |
| 20 | 19004963774880799438801 |