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 | 2 |
| 2 | 7 |
| 3 | 29 |
| 4 | 109 |
| 5 | 416 |
| 6 | 1596 |
| 7 | 6105 |
| 8 | 23362 |
| 9 | 89415 |
| 10 | 342193 |
| 11 | 1309593 |
| 12 | 5011920 |
| 13 | 19180976 |
| 14 | 73406985 |
| 15 | 280933906 |
| 16 | 1075154535 |
| 17 | 4114694797 |
| 18 | 15747237101 |
| 19 | 60265824784 |
| 20 | 230641706484 |
| 21 | 882682631025 |
| 22 | 3378090801226 |
| 23 | 12928199853783 |
| 24 | 49477163668857 |
| 25 | 189352713633433 |