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 | 34 |
| 4 | 115 |
| 5 | 388 |
| 6 | 1309 |
| 7 | 4417 |
| 8 | 14905 |
| 9 | 50296 |
| 10 | 169720 |
| 11 | 572707 |
| 12 | 1932556 |
| 13 | 6521263 |
| 14 | 22005505 |
| 15 | 74255899 |
| 16 | 250570870 |
| 17 | 845532298 |
| 18 | 2853184279 |
| 19 | 9627852832 |
| 20 | 32488455385 |
| 21 | 109629815881 |
| 22 | 369937455865 |
| 23 | 1248325741972 |
| 24 | 4212380047936 |