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 | 9 |
| 3 | 97 |
| 4 | 959 |
| 5 | 10150 |
| 6 | 106411 |
| 7 | 1120383 |
| 8 | 11791412 |
| 9 | 124095989 |
| 10 | 1306056075 |
| 11 | 13745692417 |
| 12 | 144667727920 |
| 13 | 1522567835402 |
| 14 | 16024396462730 |
| 15 | 168650144696133 |
| 16 | 1774973019338383 |
| 17 | 18680856897784860 |
| 18 | 196608292474782756 |