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 | 19 |
| 2 | 247 |
| 3 | 2743 |
| 4 | 28063 |
| 5 | 273847 |
| 6 | 2596399 |
| 7 | 24174631 |
| 8 | 222479455 |
| 9 | 2032023895 |
| 10 | 18467516431 |
| 11 | 167287650439 |
| 12 | 1512085646527 |
| 13 | 13647818683063 |
| 14 | 123064923768943 |
| 15 | 1108992721390567 |
| 16 | 9989389232302879 |
| 17 | 89955248709321751 |