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 | 15 |
| 2 | 149 |
| 3 | 1419 |
| 4 | 11833 |
| 5 | 89527 |
| 6 | 622573 |
| 7 | 4031123 |
| 8 | 24499121 |
| 9 | 140246303 |
| 10 | 759891589 |
| 11 | 3936654683 |
| 12 | 19595418729 |
| 13 | 94005744199 |
| 14 | 435555727453 |
| 15 | 1952358697443 |
| 16 | 8479351841889 |
| 17 | 35738244759855 |
| 18 | 146442095372661 |
| 19 | 584453833956395 |