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 | 15 |
| 3 | 213 |
| 4 | 2337 |
| 5 | 23231 |
| 6 | 231651 |
| 7 | 2349105 |
| 8 | 23926057 |
| 9 | 242539688 |
| 10 | 2437578213 |
| 11 | 24286001675 |
| 12 | 240505616138 |
| 13 | 2376317894981 |
| 14 | 23497985025226 |
| 15 | 232875555403623 |
| 16 | 2312981893109766 |