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 | 13 |
| 3 | 133 |
| 4 | 1321 |
| 5 | 13081 |
| 6 | 129493 |
| 7 | 1281853 |
| 8 | 12689041 |
| 9 | 125608561 |
| 10 | 1243396573 |
| 11 | 12308357173 |
| 12 | 121840175161 |
| 13 | 1206093394441 |
| 14 | 11939093769253 |
| 15 | 118184844298093 |
| 16 | 1169909349211681 |
| 17 | 11580908647818721 |
| 18 | 114639177128975533 |
| 19 | 1134810862641936613 |
| 20 | 11233469449290390601 |