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 | 21 |
| 2 | 610 |
| 3 | 17711 |
| 4 | 514229 |
| 5 | 14930352 |
| 6 | 433494437 |
| 7 | 12586269025 |
| 8 | 365435296162 |
| 9 | 10610209857723 |
| 10 | 308061521170129 |
| 11 | 8944394323791464 |
| 12 | 259695496911122585 |
| 13 | 7540113804746346429 |
| 14 | 218922995834555169026 |
| 15 | 6356306993006846248183 |