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 | 3 |
| 2 | 21 |
| 3 | 99 |
| 4 | 1209 |
| 5 | 9123 |
| 6 | 164331 |
| 7 | 34437 |
| 8 | 823467 |
| 9 | 11066355 |
| 10 | 330317679 |
| 11 | 1355321733 |
| 12 | 990324351 |
| 13 | 19205317149 |
| 14 | 802205873349 |
| 15 | 815985479709 |
| 16 | 38957620226163 |
| 17 | 197637723726063 |
| 18 | 10617280487243739 |
| 19 | 75264900895382073 |