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 | 5 |
| 1 | 49 |
| 2 | 445 |
| 3 | 4009 |
| 4 | 36085 |
| 5 | 324769 |
| 6 | 2922925 |
| 7 | 26306329 |
| 8 | 236756965 |
| 9 | 2130812689 |
| 10 | 19177314205 |
| 11 | 172595827849 |
| 12 | 1553362450645 |
| 13 | 13980262055809 |
| 14 | 125822358502285 |
| 15 | 1132401226520569 |
| 16 | 10191611038685125 |
| 17 | 91724499348166129 |
| 18 | 825520494133495165 |