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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 765 |
| 5 | 34651 |
| 6 | 2502213 |
| 7 | 263824891 |
| 8 | 38248036725 |
| 9 | 7298877611371 |
| 10 | 1773652375115973 |
| 11 | 534749297993098651 |
| 12 | 195883403209280580885 |
| 13 | 85687658454617655817291 |
| 14 | 44120264185381411695106533 |
| 15 | 26413555571018242181844978811 |