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 | 4 |
| 2 | 24 |
| 3 | 176 |
| 4 | 1492 |
| 5 | 14220 |
| 6 | 149812 |
| 7 | 1724760 |
| 8 | 21519108 |
| 9 | 289101836 |
| 10 | 4160750192 |
| 11 | 63873461064 |
| 12 | 1042061108096 |
| 13 | 18008563271632 |
| 14 | 328712410879632 |
| 15 | 6320649807989400 |
| 16 | 127724091041379492 |
| 17 | 2706397280528315148 |