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 | 5 |
| 2 | 29 |
| 3 | 245 |
| 4 | 2189 |
| 5 | 19685 |
| 6 | 177149 |
| 7 | 1594325 |
| 8 | 14348909 |
| 9 | 129140165 |
| 10 | 1162261469 |
| 11 | 10460353205 |
| 12 | 94143178829 |
| 13 | 847288609445 |
| 14 | 7625597484989 |
| 15 | 68630377364885 |
| 16 | 617673396283949 |
| 17 | 5559060566555525 |
| 18 | 50031545098999709 |
| 19 | 450283905890997365 |
| 20 | 4052555153018976269 |