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 | 429 |
| 2 | 14589 |
| 3 | 137089 |
| 4 | 702297 |
| 5 | 2537781 |
| 6 | 7312789 |
| 7 | 17981769 |
| 8 | 39322929 |
| 9 | 78571837 |
| 10 | 146150061 |
| 11 | 256488849 |
| 12 | 428947849 |
| 13 | 688828869 |
| 14 | 1068484677 |
| 15 | 1608522841 |
| 16 | 2359104609 |
| 17 | 3381338829 |
| 18 | 4748770909 |
| 19 | 6548966817 |