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 | 9 |
| 2 | 129 |
| 3 | 1881 |
| 4 | 27441 |
| 5 | 400329 |
| 6 | 5840289 |
| 7 | 85202361 |
| 8 | 1242993681 |
| 9 | 18133691049 |
| 10 | 264547403649 |
| 11 | 3859408908441 |
| 12 | 56303849204721 |
| 13 | 821401284620169 |
| 14 | 11983196174074209 |
| 15 | 174819534903392121 |
| 16 | 2550393846506436561 |