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 | 18 |
| 3 | 183 |
| 4 | 1927 |
| 5 | 20655 |
| 6 | 224498 |
| 7 | 2465815 |
| 8 | 27304863 |
| 9 | 304313548 |
| 10 | 3409370698 |
| 11 | 38362211823 |
| 12 | 433219457730 |
| 13 | 4907408334066 |
| 14 | 55737813431070 |
| 15 | 634528087334283 |
| 16 | 7238225267825429 |
| 17 | 82716464152842756 |
| 18 | 946771870186411896 |
| 19 | 10852263461880981957 |