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 | 7 |
| 2 | 25 |
| 3 | 101 |
| 4 | 321 |
| 5 | 1075 |
| 6 | 3426 |
| 7 | 9958 |
| 8 | 30253 |
| 9 | 92735 |
| 10 | 253731 |
| 11 | 739303 |
| 12 | 2056915 |
| 13 | 5899304 |
| 14 | 17108660 |
| 15 | 46137324 |
| 16 | 130016549 |
| 17 | 370248450 |
| 18 | 993480845 |
| 19 | 2766546762 |
| 20 | 7510827752 |
| 21 | 20798505510 |
| 22 | 58123818148 |
| 23 | 155141346542 |
| 24 | 426530329383 |