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 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 34 |
| 6 | 169 |
| 7 | 1019 |
| 8 | 6710 |
| 9 | 47104 |
| 10 | 342772 |
| 11 | 2566209 |
| 12 | 19621256 |
| 13 | 152669854 |
| 14 | 1205358482 |
| 15 | 9636786366 |
| 16 | 77890590994 |
| 17 | 635628049370 |
| 18 | 5231328157060 |
| 19 | 43382605871299 |
| 20 | 362225044991368 |
| 21 | 3043083681629249 |
| 22 | 25708398651274529 |
| 23 | 218296978274674435 |
| 24 | 1862280135781609982 |