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 | 18 |
| 2 | 243 |
| 3 | 3240 |
| 4 | 43239 |
| 5 | 574908 |
| 6 | 7618438 |
| 7 | 100803036 |
| 8 | 1332343288 |
| 9 | 17596479795 |
| 10 | 232248063316 |
| 11 | 3063288809012 |
| 12 | 40374425656248 |
| 13 | 531653418284628 |
| 14 | 6989320578825358 |
| 15 | 91365146187124313 |