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 | 8 |
| 2 | 38 |
| 3 | 141 |
| 4 | 455 |
| 5 | 1350 |
| 6 | 3805 |
| 7 | 10395 |
| 8 | 27875 |
| 9 | 73945 |
| 10 | 194961 |
| 11 | 512303 |
| 12 | 1343768 |
| 13 | 3521381 |
| 14 | 9223435 |
| 15 | 24152800 |
| 16 | 63239810 |
| 17 | 165572615 |
| 18 | 433485350 |
| 19 | 1134892290 |
| 20 | 2971202146 |
| 21 | 7778726798 |
| 22 | 20364993198 |
| 23 | 53316270346 |
| 24 | 139583838315 |