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 | 2 |
| 1 | 16 |
| 2 | 142 |
| 3 | 1276 |
| 4 | 11482 |
| 5 | 103336 |
| 6 | 930022 |
| 7 | 8370196 |
| 8 | 75331762 |
| 9 | 677985856 |
| 10 | 6101872702 |
| 11 | 54916854316 |
| 12 | 494251688842 |
| 13 | 4448265199576 |
| 14 | 40034386796182 |
| 15 | 360309481165636 |
| 16 | 3242785330490722 |
| 17 | 29185067974416496 |
| 18 | 262665611769748462 |
| 19 | 2363990505927736156 |
| 20 | 21275914553349625402 |
| 21 | 191483230980146628616 |