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 | 6 |
| 1 | 25 |
| 2 | 306 |
| 3 | 1249 |
| 4 | 15294 |
| 5 | 62425 |
| 6 | 764394 |
| 7 | 3120001 |
| 8 | 38204406 |
| 9 | 155937625 |
| 10 | 1909455906 |
| 11 | 7793761249 |
| 12 | 95434590894 |
| 13 | 389532124825 |
| 14 | 4769820088794 |
| 15 | 19468812480001 |
| 16 | 238395569848806 |
| 17 | 973051091875225 |
| 18 | 11915008672351506 |