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 | 4 |
| 1 | 147 |
| 2 | 4095 |
| 3 | 107415 |
| 4 | 2837835 |
| 5 | 77567490 |
| 6 | 2219186970 |
| 7 | 66782365650 |
| 8 | 2117393828550 |
| 9 | 70731036701325 |
| 10 | 2487181536464625 |
| 11 | 91943495971952625 |
| 12 | 3567666639475063125 |
| 13 | 145075480675658032500 |
| 14 | 6172232487370191742500 |