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) |
|---|---|
| 1 | 4 |
| 2 | 9 |
| 3 | 12 |
| 4 | 25 |
| 5 | 27 |
| 6 | 169 |
| 7 | 1102 |
| 8 | 7921 |
| 9 | 22287 |
| 10 | 54289 |
| 11 | 103823 |
| 12 | 777627 |
| 13 | 876897 |
| 14 | 2550409 |
| 15 | 20854593 |
| 16 | 34652571 |
| 17 | 144237401 |
| 18 | 144342653 |
| 19 | 167901581 |
| 20 | 267911895 |
| 21 | 792504416 |
| 22 | 821223649 |
| 23 | 1103528482 |
| 24 | 2040412557 |
| 25 | 2852002829 |
| 26 | 3493254541 |
| 27 | 6033671841 |
| 28 | 15658859018 |
| 29 | 116085000401 |