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 | 0 |
| 1 | 5 |
| 2 | 35 |
| 3 | 215 |
| 4 | 1295 |
| 5 | 7775 |
| 6 | 46655 |
| 7 | 279935 |
| 8 | 1679615 |
| 9 | 10077695 |
| 10 | 60466175 |
| 11 | 362797055 |
| 12 | 2176782335 |
| 13 | 13060694015 |
| 14 | 78364164095 |
| 15 | 470184984575 |
| 16 | 2821109907455 |
| 17 | 16926659444735 |
| 18 | 101559956668415 |
| 19 | 609359740010495 |
| 20 | 3656158440062975 |
| 21 | 21936950640377855 |
| 22 | 131621703842267135 |