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 | 324 |
| 2 | 2160 |
| 3 | 14400 |
| 4 | 60000 |
| 5 | 250000 |
| 6 | 787500 |
| 7 | 2480625 |
| 8 | 6482700 |
| 9 | 16941456 |
| 10 | 38723328 |
| 11 | 88510464 |
| 12 | 182891520 |
| 13 | 377913600 |
| 14 | 721710000 |
| 15 | 1378265625 |
| 16 | 2470668750 |
| 17 | 4428902500 |
| 18 | 7537186800 |
| 19 | 12826921536 |
| 20 | 20901168288 |
| 21 | 34057964304 |
| 22 | 53488469580 |
| 23 | 84004327225 |