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 | 13 |
| 2 | 129 |
| 3 | 1357 |
| 4 | 14721 |
| 5 | 161293 |
| 6 | 1772289 |
| 7 | 19489357 |
| 8 | 214365441 |
| 9 | 2357967373 |
| 10 | 25937483649 |
| 11 | 285311847757 |
| 12 | 3138428908161 |
| 13 | 34522713738253 |
| 14 | 379749838366209 |
| 15 | 4177248183764557 |
| 16 | 45949729906618881 |
| 17 | 505447028628433933 |