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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 12 |
| 5 | 41 |
| 6 | 53 |
| 7 | 306 |
| 8 | 665 |
| 9 | 15601 |
| 10 | 31867 |
| 11 | 79335 |
| 12 | 111202 |
| 13 | 190537 |
| 14 | 10590737 |
| 15 | 10781274 |
| 16 | 53715833 |
| 17 | 171928773 |
| 18 | 225644606 |
| 19 | 397573379 |
| 20 | 6189245291 |
| 21 | 6586818670 |
| 22 | 65470613321 |
| 23 | 137528045312 |
| 24 | 753110839881 |
| 25 | 5409303924479 |
| 26 | 6162414764360 |