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 | 4 |
| 3 | 15151 |
| 4 | 45154 |
| 5 | 66466 |
| 6 | 92629 |
| 7 | 98689 |
| 8 | 4976794 |
| 9 | 6424246 |
| 10 | 648616846 |
| 11 | 136287949782631 |
| 12 | 479573060375974 |
| 13 | 69465717171756496 |
| 14 | 4345218593958125434 |
| 15 | 42097537753535773579024 |
| 16 | 58071646151315164617085 |
| 17 | 6220959179720279719590226 |
| 18 | 458122911526080625119221854 |