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 | 2 |
| 2 | 21 |
| 3 | 44 |
| 4 | 725 |
| 5 | 1494 |
| 6 | 2219 |
| 7 | 10370 |
| 8 | 22959 |
| 9 | 33329 |
| 10 | 722868 |
| 11 | 756197 |
| 12 | 2991459 |
| 13 | 15713492 |
| 14 | 18704951 |
| 15 | 53123394 |
| 16 | 71828345 |
| 17 | 124951739 |
| 18 | 321731823 |
| 19 | 3664001792 |
| 20 | 18641740783 |
| 21 | 22305742575 |
| 22 | 85558968508 |
| 23 | 107864711083 |
| 24 | 301288390674 |
| 25 | 8242651259281 |
| 26 | 33271893427798 |
| 27 | 41514544687079 |