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 | 5 |
| 2 | 32 |
| 3 | 207 |
| 4 | 1280 |
| 5 | 7751 |
| 6 | 46620 |
| 7 | 279887 |
| 8 | 1679552 |
| 9 | 10077615 |
| 10 | 60466076 |
| 11 | 362796935 |
| 12 | 2176782192 |
| 13 | 13060693847 |
| 14 | 78364163900 |
| 15 | 470184984351 |
| 16 | 2821109907200 |
| 17 | 16926659444447 |
| 18 | 101559956668092 |
| 19 | 609359740010135 |