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) |
|---|---|
| 1 | 1 |
| 2 | 50 |
| 3 | 834 |
| 4 | 7890 |
| 5 | 51990 |
| 6 | 265434 |
| 7 | 1119210 |
| 8 | 4063866 |
| 9 | 13081875 |
| 10 | 38131900 |
| 11 | 102259964 |
| 12 | 255425340 |
| 13 | 600047436 |
| 14 | 1336192860 |
| 15 | 2838530460 |
| 16 | 5783112156 |
| 17 | 11350211925 |
| 18 | 21540508734 |
| 19 | 39656591950 |
| 20 | 71021001950 |
| 21 | 124026854850 |
| 22 | 211648774950 |
| 23 | 353581802550 |
| 24 | 579225802950 |
| 25 | 931794553575 |