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 | 7 |
| 2 | 198 |
| 3 | 5929 |
| 4 | 145168 |
| 5 | 2459994 |
| 6 | 30170387 |
| 7 | 282159907 |
| 8 | 2114430613 |
| 9 | 13190940964 |
| 10 | 70598379694 |
| 11 | 331820068035 |
| 12 | 1395291176641 |
| 13 | 5327752138987 |
| 14 | 18698405435444 |
| 15 | 60922707883197 |
| 16 | 185814239933254 |
| 17 | 534246250634068 |
| 18 | 1456622823771075 |