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 | 0 |
| 2 | 4 |
| 3 | 321 |
| 4 | 12473 |
| 5 | 334678 |
| 6 | 7194272 |
| 7 | 131828470 |
| 8 | 2123742189 |
| 9 | 30640203562 |
| 10 | 401048016071 |
| 11 | 4810088202077 |
| 12 | 53296059497663 |
| 13 | 549269826112794 |
| 14 | 5296062641795037 |
| 15 | 48015356253123416 |