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 | 3 |
| 1 | 15 |
| 2 | 101 |
| 3 | 801 |
| 4 | 6833 |
| 5 | 60105 |
| 6 | 535601 |
| 7 | 4799481 |
| 8 | 43112513 |
| 9 | 387683145 |
| 10 | 3487834001 |
| 11 | 31385255961 |
| 12 | 282446317793 |
| 13 | 2541932945385 |
| 14 | 22877060906801 |
| 15 | 205892205869241 |
| 16 | 1853024483884673 |
| 17 | 16677198879666825 |
| 18 | 150094704016738001 |