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 | 33 |
| 2 | 609 |
| 3 | 10945 |
| 4 | 196417 |
| 5 | 3524577 |
| 6 | 63245985 |
| 7 | 1134903169 |
| 8 | 20365011073 |
| 9 | 365435296161 |
| 10 | 6557470319841 |
| 11 | 117669030460993 |
| 12 | 2111485077978049 |
| 13 | 37889062373143905 |
| 14 | 679891637638612257 |
| 15 | 12200160415121876737 |