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 | 10 |
| 3 | 33 |
| 4 | 108 |
| 5 | 351 |
| 6 | 1134 |
| 7 | 3645 |
| 8 | 11664 |
| 9 | 37179 |
| 10 | 118098 |
| 11 | 373977 |
| 12 | 1180980 |
| 13 | 3720087 |
| 14 | 11691702 |
| 15 | 36669429 |
| 16 | 114791256 |
| 17 | 358722675 |
| 18 | 1119214746 |
| 19 | 3486784401 |
| 20 | 10847773692 |
| 21 | 33705582543 |
| 22 | 104603532030 |
| 23 | 324270949293 |
| 24 | 1004193907488 |