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 | 17 |
| 2 | 72 |
| 3 | 2431 |
| 4 | 5112 |
| 5 | 85697 |
| 6 | 357912 |
| 7 | 23835887 |
| 8 | 24721272 |
| 9 | 408926687 |
| 10 | 1685915352 |
| 11 | 55444767181 |
| 12 | 113654162232 |
| 13 | 1859089273877 |
| 14 | 7584695511192 |
| 15 | 988081196223199 |
| 16 | 501829640287992 |
| 17 | 8141400285401267 |
| 18 | 32967597006585432 |
| 19 | 1066454822660748331 |
| 20 | 2153382250687098552 |