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) |
|---|---|
| 2 | 1 |
| 3 | 30 |
| 4 | 449 |
| 5 | 4795 |
| 6 | 41850 |
| 7 | 319320 |
| 8 | 2213665 |
| 9 | 14283280 |
| 10 | 87169790 |
| 11 | 508887860 |
| 12 | 2865204762 |
| 13 | 15654301865 |
| 14 | 83388235348 |
| 15 | 434685964540 |
| 16 | 2223970137825 |
| 17 | 11194499812388 |
| 18 | 55546566721430 |
| 19 | 272142754971892 |
| 20 | 1318317357277470 |
| 21 | 6321681903231990 |
| 22 | 30037740651227756 |
| 23 | 141545610360126400 |