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 | 201 |
| 2 | 7001 |
| 3 | 104881 |
| 4 | 927441 |
| 5 | 5707449 |
| 6 | 26986089 |
| 7 | 104535009 |
| 8 | 346615329 |
| 9 | 1014889769 |
| 10 | 2684641785 |
| 11 | 6526963345 |
| 12 | 14778775025 |
| 13 | 31490462745 |
| 14 | 63670078985 |
| 15 | 122977987009 |
| 16 | 228167048769 |
| 17 | 408511495049 |
| 18 | 708522994329 |
| 19 | 1194315679089 |
| 20 | 1962053519121 |
| 21 | 3148993975161 |