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 | 171 |
| 3 | 4869 |
| 4 | 184851 |
| 5 | 8772309 |
| 6 | 499559571 |
| 7 | 33190014069 |
| 8 | 2520110222451 |
| 9 | 215270320769109 |
| 10 | 20431783142389971 |
| 11 | 2133148392099721269 |
| 12 | 242954208655633344051 |
| 13 | 29977118969127060357909 |
| 14 | 3983272698956314883956371 |
| 15 | 567091857051921058649396469 |