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 | 6 |
| 2 | 37 |
| 3 | 233 |
| 4 | 1490 |
| 5 | 9633 |
| 6 | 62753 |
| 7 | 410926 |
| 8 | 2700349 |
| 9 | 17786985 |
| 10 | 117346714 |
| 11 | 774991289 |
| 12 | 5121849473 |
| 13 | 33865596822 |
| 14 | 223987930325 |
| 15 | 1481764925737 |
| 16 | 9803764203682 |
| 17 | 64870223394129 |
| 18 | 429263295428641 |
| 19 | 2840659771285310 |
| 20 | 18798621916707821 |