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 | 11 |
| 1 | 31 |
| 2 | 151 |
| 3 | 911 |
| 4 | 5951 |
| 5 | 40051 |
| 6 | 272611 |
| 7 | 1863551 |
| 8 | 12760031 |
| 9 | 87424711 |
| 10 | 599129311 |
| 11 | 4106261531 |
| 12 | 28144128251 |
| 13 | 192901135711 |
| 14 | 1322159893351 |
| 15 | 9062207833151 |
| 16 | 62113268013311 |
| 17 | 425730597768451 |
| 18 | 2918000731816531 |
| 19 | 20000274041790911 |
| 20 | 137083916295800111 |
| 21 | 939587136717207031 |
| 22 | 6440026032054760351 |