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 | 5 |
| 1 | 41 |
| 2 | 293 |
| 3 | 2057 |
| 4 | 14405 |
| 5 | 100841 |
| 6 | 705893 |
| 7 | 4941257 |
| 8 | 34588805 |
| 9 | 242121641 |
| 10 | 1694851493 |
| 11 | 11863960457 |
| 12 | 83047723205 |
| 13 | 581334062441 |
| 14 | 4069338437093 |
| 15 | 28485369059657 |
| 16 | 199397583417605 |
| 17 | 1395783083923241 |
| 18 | 9770481587462693 |
| 19 | 68393371112238857 |