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 | 10 |
| 3 | 99 |
| 4 | 820 |
| 5 | 7145 |
| 6 | 62161 |
| 7 | 546620 |
| 8 | 4880832 |
| 9 | 43998523 |
| 10 | 400227154 |
| 11 | 3669302718 |
| 12 | 33866741579 |
| 13 | 314396207096 |
| 14 | 2933381107473 |
| 15 | 27490151938062 |
| 16 | 258629969639330 |
| 17 | 2441659478947916 |
| 18 | 23122602510585989 |