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 | 12 |
| 2 | 83 |
| 3 | 486 |
| 4 | 2645 |
| 5 | 13872 |
| 6 | 71303 |
| 7 | 362346 |
| 8 | 1829225 |
| 9 | 9198612 |
| 10 | 46150523 |
| 11 | 231225006 |
| 12 | 1157542205 |
| 13 | 5791962552 |
| 14 | 28972567343 |
| 15 | 144901100466 |
| 16 | 724620293585 |
| 17 | 3623445841692 |
| 18 | 18118262329763 |
| 19 | 90594411012726 |
| 20 | 452981353155365 |
| 21 | 2264934660052032 |
| 22 | 11324756983085783 |