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 | 13 |
| 2 | 104 |
| 3 | 637 |
| 4 | 3276 |
| 5 | 14820 |
| 6 | 60697 |
| 7 | 229360 |
| 8 | 810498 |
| 9 | 2705118 |
| 10 | 8592857 |
| 11 | 26134654 |
| 12 | 76476816 |
| 13 | 216174700 |
| 14 | 592220696 |
| 15 | 1576826355 |
| 16 | 4090222409 |
| 17 | 10357895639 |
| 18 | 25653139694 |
| 19 | 62235901689 |
| 20 | 148108568986 |
| 21 | 346176981673 |
| 22 | 795569268689 |
| 23 | 1799508071426 |
| 24 | 4009753651904 |
| 25 | 8808973137510 |