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 | 3 |
| 2 | 240 |
| 3 | 2728 |
| 4 | 66372 |
| 5 | 1573479 |
| 6 | 29691127 |
| 7 | 591482528 |
| 8 | 11959837149 |
| 9 | 234588752099 |
| 10 | 4630258704238 |
| 11 | 91650397488268 |
| 12 | 1806082543597960 |
| 13 | 35618855441537594 |
| 14 | 702809886558706588 |
| 15 | 13858157412186691169 |
| 16 | 273285931814164349815 |