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 | 11 |
| 2 | 91 |
| 3 | 781 |
| 4 | 6691 |
| 5 | 57343 |
| 6 | 491429 |
| 7 | 4211559 |
| 8 | 36093157 |
| 9 | 309319197 |
| 10 | 2650872719 |
| 11 | 22718040927 |
| 12 | 194694139719 |
| 13 | 1668533310731 |
| 14 | 14299369323775 |
| 15 | 122545928057115 |
| 16 | 1050221456858969 |
| 17 | 9000422339067177 |
| 18 | 77133829015319501 |