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 | 13 |
| 2 | 169 |
| 3 | 611 |
| 4 | 2173 |
| 5 | 6766 |
| 6 | 22322 |
| 7 | 75557 |
| 8 | 246840 |
| 9 | 813373 |
| 10 | 2700122 |
| 11 | 8903029 |
| 12 | 29382065 |
| 13 | 97138711 |
| 14 | 320761206 |
| 15 | 1059193011 |
| 16 | 3498970917 |
| 17 | 11556218541 |
| 18 | 38166121069 |
| 19 | 126060198626 |
| 20 | 416354317573 |
| 21 | 1375125698303 |
| 22 | 4541820382522 |
| 23 | 15000835767813 |