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 | 15 |
| 2 | 395 |
| 3 | 15525 |
| 4 | 813671 |
| 5 | 53306325 |
| 6 | 4190730335 |
| 7 | 384368222925 |
| 8 | 40289992211591 |
| 9 | 4751157347330085 |
| 10 | 622528350091484975 |
| 11 | 89724601853904952125 |
| 12 | 14107579506569655343511 |
| 13 | 2403010007367884873188245 |
| 14 | 440801776092151383251034815 |
| 15 | 86635186648455606881413582125 |
| 16 | 18162432724968339044562784395431 |