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 | 97 |
| 3 | 1065 |
| 4 | 11713 |
| 5 | 128841 |
| 6 | 1417249 |
| 7 | 15589737 |
| 8 | 171487105 |
| 9 | 1886358153 |
| 10 | 20749939681 |
| 11 | 228249336489 |
| 12 | 2510742701377 |
| 13 | 27618169715145 |
| 14 | 303799866866593 |
| 15 | 3341798535532521 |
| 16 | 36759783890857729 |
| 17 | 404357622799435017 |