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 | 8 |
| 2 | 9 |
| 3 | 17 |
| 4 | 145 |
| 5 | 4947 |
| 6 | 39721 |
| 7 | 44668 |
| 8 | 84389 |
| 9 | 719780 |
| 10 | 24556909 |
| 11 | 197175052 |
| 12 | 221731961 |
| 13 | 418907013 |
| 14 | 3572988065 |
| 15 | 121900501223 |
| 16 | 978776997849 |
| 17 | 1100677499072 |
| 18 | 2079454496921 |
| 19 | 17736313474440 |
| 20 | 605114112627881 |
| 21 | 4858649214497488 |
| 22 | 5463763327125369 |
| 23 | 10322412541622857 |