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 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 21 |
| 5 | 57 |
| 6 | 121 |
| 7 | 305 |
| 8 | 657 |
| 9 | 1505 |
| 10 | 3233 |
| 11 | 7489 |
| 12 | 15169 |
| 13 | 34433 |
| 14 | 72833 |
| 15 | 156929 |
| 16 | 325889 |
| 17 | 717313 |
| 18 | 1462785 |
| 19 | 3187713 |
| 20 | 6538241 |
| 21 | 13846529 |
| 22 | 28739585 |
| 23 | 61673473 |
| 24 | 124063745 |
| 25 | 263856129 |
| 26 | 544481281 |
| 27 | 1139032065 |
| 28 | 2326282241 |
| 29 | 4920999937 |
| 30 | 9924804609 |
| 31 | 20923351041 |
| 32 | 42635165697 |