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) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 30 |
| 4 | 210 |
| 5 | 1850 |
| 6 | 19528 |
| 7 | 233289 |
| 8 | 2805652 |
| 9 | 31522803 |
| 10 | 326897695 |
| 11 | 3190607915 |
| 12 | 30250443755 |
| 13 | 287335303424 |
| 14 | 2785929699350 |
| 15 | 27611310448037 |
| 16 | 276727430606458 |