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) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 153 |
| 3 | 3621 |
| 4 | 110637 |
| 5 | 4176549 |
| 6 | 188802141 |
| 7 | 9981491997 |
| 8 | 605817292893 |
| 9 | 41590997891929 |
| 10 | 3190816992548889 |
| 11 | 270817573670371995 |
| 12 | 25214094974302894695 |
| 13 | 2556615042094813435491 |
| 14 | 280570514270855698070535 |