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 | 3 |
| 2 | 102 |
| 3 | 733 |
| 4 | 14319 |
| 5 | 45741 |
| 6 | 1004275 |
| 7 | 3313338 |
| 8 | 169807396 |
| 9 | 259770566 |
| 10 | 20255937351 |
| 11 | 21366409911 |
| 12 | 196256438549 |
| 13 | 10949682060338 |
| 14 | 16876678891444 |
| 15 | 1376534319069676 |
| 16 | 13702579963679833 |
| 17 | 13947379867469643 |
| 18 | 360360819534753751 |
| 19 | 3421022095727840569 |
| 20 | 93257415087729395138 |
| 21 | 113268191247939457737 |