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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 111 |
| 4 | 4107 |
| 5 | 151959 |
| 6 | 5622483 |
| 7 | 22494039 |
| 8 | 208031871 |
| 9 | 225121209 |
| 10 | 832279443 |
| 11 | 7697179227 |
| 12 | 8329484733 |
| 13 | 27486820443 |
| 14 | 30794339391 |
| 15 | 92366302683 |
| 16 | 123199851603 |
| 17 | 230915528769 |
| 18 | 284795631399 |
| 19 | 308190935121 |
| 20 | 1017012356391 |