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) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 221 |
| 4 | 289 |
| 5 | 697 |
| 6 | 1819 |
| 7 | 2329 |
| 8 | 4369 |
| 9 | 4913 |
| 10 | 6439 |
| 11 | 18769 |
| 12 | 21331 |
| 13 | 35209 |
| 14 | 66049 |
| 15 | 128881 |
| 16 | 184783 |
| 17 | 197143 |
| 18 | 258121 |
| 19 | 281929 |
| 20 | 516961 |
| 21 | 739903 |
| 22 | 971203 |
| 23 | 1762249 |
| 24 | 1942663 |
| 25 | 2070721 |
| 26 | 2898703 |
| 27 | 2952673 |
| 28 | 3820819 |
| 29 | 4142881 |
| 30 | 5550943 |
| 31 | 5869681 |
| 32 | 8288641 |
| 33 | 16230481 |
| 34 | 16773619 |