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 | 1 |
| 2 | 9 |
| 3 | 28 |
| 4 | 129 |
| 5 | 126 |
| 6 | 1458 |
| 7 | 344 |
| 8 | 8705 |
| 9 | 20413 |
| 10 | 49394 |
| 11 | 1332 |
| 12 | 1104114 |
| 13 | 2198 |
| 14 | 2217546 |
| 15 | 16305408 |
| 16 | 33820673 |
| 17 | 4914 |
| 18 | 532253187 |
| 19 | 6860 |
| 20 | 2392632274 |
| 21 | 10500716072 |
| 22 | 8591716802 |
| 23 | 12168 |
| 24 | 422182489826 |
| 25 | 30517593751 |
| 26 | 549760658274 |
| 27 | 7625984925160 |