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 | 7 |
| 3 | 13 |
| 4 | 139 |
| 5 | 259 |
| 6 | 2773 |
| 7 | 5167 |
| 8 | 55321 |
| 9 | 103081 |
| 10 | 1103647 |
| 11 | 2056453 |
| 12 | 22017619 |
| 13 | 41025979 |
| 14 | 439248733 |
| 15 | 818463127 |
| 16 | 8762957041 |
| 17 | 16328236561 |
| 18 | 174819892087 |
| 19 | 325746268093 |
| 20 | 3487634884699 |
| 21 | 6498597125299 |
| 22 | 69577877801893 |
| 23 | 129646196237887 |
| 24 | 1388069921153161 |
| 25 | 2586425327632441 |