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 | 3 |
| 2 | 13 |
| 3 | 64 |
| 4 | 334 |
| 5 | 1802 |
| 6 | 9933 |
| 7 | 55575 |
| 8 | 314362 |
| 9 | 1793126 |
| 10 | 10295625 |
| 11 | 59430043 |
| 12 | 344559826 |
| 13 | 2005026610 |
| 14 | 11703965955 |
| 15 | 68503652100 |
| 16 | 401892122682 |
| 17 | 2362629703214 |
| 18 | 13914547415998 |
| 19 | 82081163986020 |
| 20 | 484893156220356 |
| 21 | 2868234297838092 |
| 22 | 16986185485228431 |
| 23 | 100703275233924096 |