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) |
|---|---|
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 13 |
| 8 | 38 |
| 9 | 149 |
| 10 | 703 |
| 11 | 4132 |
| 12 | 29579 |
| 13 | 245627 |
| 14 | 2291589 |
| 15 | 23466857 |
| 16 | 259974248 |
| 17 | 3087698618 |
| 18 | 39075020582 |
| 19 | 524492748500 |
| 20 | 7439833931266 |
| 21 | 111179110620163 |
| 22 | 1745593888011626 |
| 23 | 28726140345832290 |
| 24 | 494406533261250407 |
| 25 | 8881990236308687928 |
| 26 | 166255686198172837111 |
| 27 | 3237191621055524796848 |
| 28 | 65467841616499410561220 |