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 | 9 |
| 2 | 241 |
| 3 | 9129 |
| 4 | 402321 |
| 5 | 19321689 |
| 6 | 981044401 |
| 7 | 51794295849 |
| 8 | 2814649754641 |
| 9 | 156399050208729 |
| 10 | 8845463571211521 |
| 11 | 507517525088436729 |
| 12 | 29468616564702121041 |
| 13 | 1728353228376135226329 |
| 14 | 102242911938342248555121 |
| 15 | 6093340217607472063134249 |
| 16 | 365501683327659682186607121 |
| 17 | 22049503920365906645420399769 |