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 | 57 |
| 3 | 703 |
| 4 | 3641 |
| 5 | 15501 |
| 6 | 40071 |
| 7 | 117307 |
| 8 | 233017 |
| 9 | 512461 |
| 10 | 883557 |
| 11 | 1770231 |
| 12 | 2559623 |
| 13 | 4824613 |
| 14 | 6686499 |
| 15 | 10897203 |
| 16 | 14913081 |
| 17 | 24132657 |
| 18 | 29210277 |
| 19 | 47039023 |
| 20 | 56439141 |
| 21 | 82466821 |
| 22 | 100903167 |
| 23 | 148023723 |
| 24 | 163810951 |
| 25 | 242203001 |
| 26 | 275002941 |
| 27 | 373584043 |