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 | 1 |
| 2 | 5 |
| 3 | 28 |
| 4 | 273 |
| 5 | 6251 |
| 6 | 578162 |
| 7 | 107060591 |
| 8 | 29911744769 |
| 9 | 27309372325966 |
| 10 | 100510174785157275 |
| 11 | 579282314757603925315 |
| 12 | 5692451844585536053973346 |
| 13 | 272831740026972379247127727751 |
| 14 | 36494329378701187545939734030067963 |