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 | 21 |
| 2 | 317 |
| 3 | 4169 |
| 4 | 49689 |
| 5 | 532509 |
| 6 | 5260181 |
| 7 | 48218513 |
| 8 | 415055025 |
| 9 | 3375505573 |
| 10 | 26107328109 |
| 11 | 193280122713 |
| 12 | 1374386800585 |
| 13 | 9405092131245 |
| 14 | 62077194367429 |
| 15 | 396122100447649 |
| 16 | 2449318034512737 |
| 17 | 14705097001902901 |
| 18 | 85877415063465373 |