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 | 7 |
| 2 | 29 |
| 3 | 459 |
| 4 | 1843 |
| 5 | 14723 |
| 6 | 58925 |
| 7 | 1885171 |
| 8 | 7541399 |
| 9 | 60328761 |
| 10 | 241319243 |
| 11 | 3861078495 |
| 12 | 15444365983 |
| 13 | 123554742139 |
| 14 | 494219302861 |
| 15 | 31630025688259 |
| 16 | 126520120431871 |
| 17 | 1012160898632573 |
| 18 | 4048643713939967 |
| 19 | 64778298539407877 |